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History of Composting
| Hardy Sundberg |
Jim Cooper
Excel, Year Installed: 1998
Where Installed: Alleghany
National Forest,PA
"Thanks to the Sun-Mar Excel unit I
was able to obtain a sewage
permit and begin construction on
our cabin in the Alleghany National
Forest. The Excel model was
approved as an alternative to a
septic system. We have used the
Excel model for four years and are
very satisfied with its performance."
Bob Halver
Lake Wabana, Minnesota
Compact, installed 1996
Bob says his wife Bonnie and
family are very pleased with their
Compact which is "easy to use,
very sanitary, no odors and very
attractive". The cabin is used by
three generations of Halvers and
up to four people "on a weekly
basis".
Although it is way above design
capacity, Bob says the Compact
"easily handled 8 people on
weekends". For the sake of the
Compact, we hope the fourth
generation doesn't arrive just yet!
Louise Perkins
Compact, Installed 1999
Installed at cabin in Pocono, Lake
Preserve, PA
We installed the Compact after
struggling without success with
another composting toilet for many
years. The Compact is used daily
for 4-6 weeks each summer and
then for occasional weekend use
the rest of the year. It works
wonderfully!
James A. Mauger
Compact, Installed 2000
Installed at cabin in Loudersport,
PA
This cabin has been in my family
for 40 years. We have no running
water
and for 37 years had an outhouse.
The Sun-Mar Compact is the best
investment we ever made - and at
a fraction of the cost of a well and
septic system. Using the bathroom
at night no longer involves shoes,
coat, and a flashlight!
H.R. White
Compact, Installed 1998
Installed in 2nd Bathroom
We closed in part of the back porch
to create a second bathroom and a
laundry room. The Sun-Mar works
well and avoided the necessity of
installing a second septic system.
The small stool makes it easier for
the grandchildren to use the
Sun-Mar, but we all use it.
Greg & Karen
Vermillion Bay, ON
Installed Spring 1997
Excel NE (Non-Electric)
Our experience with our Sun-Mar
non-electric composting toilet has
been nothing but positive. What a
great idea! We would & do
recommend this system to anyone
who needs an alternative to the
conventional septic system.
Our cabin is located on a 4 acre
island on Eagle Lake near
Vermilion Bay, Ontario. We built the
cabin in the early spring of 1997,
taking advantage of the ice cover to
transport the materials to the
island. We were inspected by the
local building inspector and by the
inspector from the districts' Health
Unit. They both took one look at the
Sun-Mar & inspection in that area
was ended. To say they were
happy with our choice was an
understatement. "Its the way of the
future" we were told. We agree.
Enclosed are pictures of our cabin,
our Sun-Mar and of course us.
Again - we are very satisfied with
the product and with the service we
received from the service
department when we had
questions. It has been a positive
experience throughout.
-Greg & Karen Miels
Edward Hand
Excel NE - Installed 2001
Installed at Cottage in Seeley's
Bay, ON
Our cottage near Seeley's Bay,
Ontario is very rustic with no
electricity or running water/septic.
We've had our Sun-Mar Excel-NE
just over a year and are very
pleased with the results - no
mess, no smell, and much more
pleasant than the "outhouse".
Betty Beange
Excel NE, Installed 2000
Installed at camp in Ontario
My son & I built a camp in May
2000. Water was not available, so
we heard about Sun-Mar
composting toilets. We then got
some information and purchased
the Excel NE in August 2000 and
have never regretted it. It works like
a charm.
Excel, Year Installed: 1998
Where Installed: Alleghany
National Forest,PA
"Thanks to the Sun-Mar Excel unit I
was able to obtain a sewage
permit and begin construction on
our cabin in the Alleghany National
Forest. The Excel model was
approved as an alternative to a
septic system. We have used the
Excel model for four years and are
very satisfied with its performance."
Bob Halver
Lake Wabana, Minnesota
Compact, installed 1996
Bob says his wife Bonnie and
family are very pleased with their
Compact which is "easy to use,
very sanitary, no odors and very
attractive". The cabin is used by
three generations of Halvers and
up to four people "on a weekly
basis".
Although it is way above design
capacity, Bob says the Compact
"easily handled 8 people on
weekends". For the sake of the
Compact, we hope the fourth
generation doesn't arrive just yet!
Louise Perkins
Compact, Installed 1999
Installed at cabin in Pocono, Lake
Preserve, PA
We installed the Compact after
struggling without success with
another composting toilet for many
years. The Compact is used daily
for 4-6 weeks each summer and
then for occasional weekend use
the rest of the year. It works
wonderfully!
James A. Mauger
Compact, Installed 2000
Installed at cabin in Loudersport,
PA
This cabin has been in my family
for 40 years. We have no running
water
and for 37 years had an outhouse.
The Sun-Mar Compact is the best
investment we ever made - and at
a fraction of the cost of a well and
septic system. Using the bathroom
at night no longer involves shoes,
coat, and a flashlight!
H.R. White
Compact, Installed 1998
Installed in 2nd Bathroom
We closed in part of the back porch
to create a second bathroom and a
laundry room. The Sun-Mar works
well and avoided the necessity of
installing a second septic system.
The small stool makes it easier for
the grandchildren to use the
Sun-Mar, but we all use it.
Greg & Karen
Vermillion Bay, ON
Installed Spring 1997
Excel NE (Non-Electric)
Our experience with our Sun-Mar
non-electric composting toilet has
been nothing but positive. What a
great idea! We would & do
recommend this system to anyone
who needs an alternative to the
conventional septic system.
Our cabin is located on a 4 acre
island on Eagle Lake near
Vermilion Bay, Ontario. We built the
cabin in the early spring of 1997,
taking advantage of the ice cover to
transport the materials to the
island. We were inspected by the
local building inspector and by the
inspector from the districts' Health
Unit. They both took one look at the
Sun-Mar & inspection in that area
was ended. To say they were
happy with our choice was an
understatement. "Its the way of the
future" we were told. We agree.
Enclosed are pictures of our cabin,
our Sun-Mar and of course us.
Again - we are very satisfied with
the product and with the service we
received from the service
department when we had
questions. It has been a positive
experience throughout.
-Greg & Karen Miels
Edward Hand
Excel NE - Installed 2001
Installed at Cottage in Seeley's
Bay, ON
Our cottage near Seeley's Bay,
Ontario is very rustic with no
electricity or running water/septic.
We've had our Sun-Mar Excel-NE
just over a year and are very
pleased with the results - no
mess, no smell, and much more
pleasant than the "outhouse".
Betty Beange
Excel NE, Installed 2000
Installed at camp in Ontario
My son & I built a camp in May
2000. Water was not available, so
we heard about Sun-Mar
composting toilets. We then got
some information and purchased
the Excel NE in August 2000 and
have never regretted it. It works like
a charm.
TESTIMONIALS
..Maack Green Solutions is a authorized dealer of SUN-MAR composting toilets. Sun-Mar is
a Canadian company that has been developing and manufacturing composting toilets since
1971. That's why the History of Sun-Mar is the History of Composting Toilets.
The First Generation Waterless Composting Toilet
..The founder of SUN-MAR, Hardy Sundberg, developed the first self contained composting
toilet in 1971. This waterless toilet had a fan and heater at the top, blowing hot air onto the
waste pile which was agitated by mechanical mixers. As the compost in the bottom was
agitated it fell though a screen into a collection chamber.
a Canadian company that has been developing and manufacturing composting toilets since
1971. That's why the History of Sun-Mar is the History of Composting Toilets.
The First Generation Waterless Composting Toilet
..The founder of SUN-MAR, Hardy Sundberg, developed the first self contained composting
toilet in 1971. This waterless toilet had a fan and heater at the top, blowing hot air onto the
waste pile which was agitated by mechanical mixers. As the compost in the bottom was
agitated it fell though a screen into a collection chamber.
..While at the time this toilet represented a big step forward in the development of composting toilets, in hindsight it can be seen to
suffer from a number of weaknesses. Firstly, this composting toilet design was what we now call a single chamber unit, which
means that the operating conditions were the same throughout the whole toilet and not optimized for the different needs of
composting, evaporation or finishing. Secondly, the fact that heat was being blown in from the top meant that the compost tended to
get dried out, while the liquid in the bottom was not evaporated efficiently. Thirdly, the compost in the bottom was not isolated and
was subject to contamination from fresh waste.
..Even today, over 30 years later, some waterless composting toilets can still be found which feature a top mounted heater with all
the attendant problems this brings. However, subsequent SUN-MAR composting toilet designs have been successful in solving
the inherent problems evident in this first waterless toilet design.
The Second Generation
..In 1977, the second generation composting toilet was born. Known as the Tropic, this waterless toilet featured one highly
significant improvement;- the heater was located in a sealed compartment in the base of the toilet. This base heater was able to
evaporate the excess liquid in the base, while allowing the compost pile to remain moist, an improvement which dramatically
increased composting speed and ease of operation
..This heater arrangement therefore overcame the big problem with top mounted heaters, namely that in evaporating liquid they
also dry out the compost pile. Drying out the pile has two undesirable affects. Firstly, aerobic microbes are reduced to the point
where composting slows to a halt, and secondly the waste cakes to a consistency somewhat like an adobe brick where it
becomes impossible to agitate the pile.
The First Central Composting Toilet System was Marketed
..In 1977 SUN-MAR extended the concept of domestic composting by offering a composting toilet system that was outside and
several feet away from the bathroom, but connected to a 1 pint toilet in the bathroom. This allowed users to have a ”normal” looking
bathroom, while still having all the benefits of composting. The use of a low flush toilet meant that compost was much easier to
keep moist. However because this toilet was not waterless, it was not always possible to evaporate all the liquid. Consequently,
the small amount of excess liquid has to be handled by an old septic, recycling bed, or other approved system.
The Third Generation
..In 1979, a further major improvement was launched. The difficulty of aerating, and providing oxygen for the aerobic microbes was
solved by replacing the pile and mechanical mixers by a Bio-drum. The Bio-drum had a door which when open allowed the waste
into the Bio-drum, and when shut allowed the Bio-drum to stay sealed when rotated. This Bio-drum arrangement gave rise to a
huge performance improvement because by rotating the drum compost could now be well mixed, and perfectly oxygenated, while
also allowing the moisture to be evenly distributed throughout the compost.
..This Bio-drum had a screen in the rear, which allowed any excess liquid to drain into the evaporating chamber in the base of the
composting toilet, thus ensuring the waste did not get saturated. Saturated waste is undesirable in a composting toilet because it
dramatically slows composting down by driving out the oxygen the aerobic microbes need to survive. A saturated compost provides
good conditions for anaerobic microbes, which are slow and odorful.
..Another major benefit to the Bio-drum arrangement was that by rotating the Bio-drum backwards, the Bio-drum door would remain
open so that the compost would drop automatically into a finishing drawer. In the drawer, compost was isolated, no longer
exposed to fresh waste, and was able to finish composting while gradually drying out. The drawer could be easily removed without
exposing the user to liquid or fresh waste.
..This was the first three chamber composting toilet, where composting was taking place in the Bio-drum, liquid was being
evaporated in the evaporating chamber and compost was being finished in a finishing drawer. All these essential processes could
now be optimized, a development which gave SUN-MAR the leadership position in the field of composting toilets,- one which it has
maintained to the present day
The Advantages of a Three Chamber Composting Toilet
Some of the advantages have been described above. Hopefully repetition will do no harm!
1. The three different chambers allow for optimizing the three different requirements for composting, evaporating and finishing.
2. The Bio-drum allows compost to be properly and completely oxygenated, rather than the partial aeration achieved by composting
toilets with fixed mechanical mixers.
3. The Bio-drum ensures there is no excess moisture, since any excess is automatically drained to the evaporating chamber.
4. By being separated from any direct heat, the material in the drum does not dry out as it would in composting toilet designs where
heat is aimed directly at the pile
5. The drum offers simplicity of operation. Tumbling the Bio-drum ensures mixing is easy and complete,.( like a cement mixer or
clothes dryer)
6. Removing compost is merely a question of rotating the Bio-drum backwards. There is no concern with sealed bases, secured by
screws and thee is no exposure to liquids and flooding
7. The Bio-drum offers the ideal environment for aerobic bacteria to prosper
8. The evaporating chamber is heated by a heater below it. The advantage this gives is similar to the advantage gained by heating
a saucepan with an element beneath, as opposed to heating with a hair dryer from above.
9. The heater is on when there is liquid to evaporate and off most of the time when there is no liquid.
10. The evaporating chamber offers the ideal environment for evaporation with air being pulled by a fan over a large surface area of
liquid warmed from beneath.
11. While in the drawer the compost is surrounded by a stream of drying air, and gradually dries out prior to removal rather than
being exposed to, and contaminated by, fresh waste and liquid.
12. The drawer is removed merely by pulling it out by hand
The First Self-contained Non Electric Waterless Composting Toilet
..So successful was the 3 chamber concept that in 1981 SUN-MAR introduced the first self-contained non-electric composting
toilet. This was identical to the electric unit of its time, except for a few important differences:
1. The non-electric toilet had a 4" vent stack rather than the 2" vent on electric units
2. There was no fan on the non-electric unit, although a 12V fan could be inserted in the vent stack if additional air movement was
needed.
3. There was no heating compartment in the base of non-electric toilets
4. The non electric composting toilet had a larger drain than the emergency safety drain on electric units
This concept proved so successful that SUN-MAR’s non-electric composting toilet remains the standard for those living off the grid.
The First Non-electric Central Composting Toilet System
..In 1987, SUN-MAR offered the first Non-electric Central Composting Toilet System. This unit incorporated similar differences that
distinguished the non-electric self-contained toilet, namely a 4" vent stack with 12V fan, and no heating compartment in the base
The First Self contained Composting Toilet to Pass North American Operating Standard
..In 1989 SUN-MAR’s Excel became the first self-contained composting toilet to pass the National Sanitation Foundation (NSF)
Standard #41. This was a 6 month residential test where no odor was permitted even under overload conditions, and only a
negligible fecal coliform count was permitted in the composted output. This meant that from 1989 regulators could confidently
permit use of a waterless SUN-MAR composting toilet.
..Today, SUN-MAR composting toilets are the only such toilets listed and certified by NSF under the new updated NSF Standard
#41 (1999) for residential and for cottage use.
The First Dual-vented Waterless Composting Toilet
..In 1991 Sun-Mar introduced a dual vented self-contained composting toilet, which operated as an electric unit when power was
available, but defaulted to non-electric operation using the 4" vent stack when it was not. This model proved to be popular for those
who had no power now but were expecting it in the future; for those operating a generator for most, but not all the time; and for
those with an insecure power supply.
1993 The Compact and the Centrex are launched
1993 was a big year for SUN-MAR. At this time the Compact and Centrex models were both launched.
..The Compact was a lower profile version of the long established Excel. It had a patented variable diameter Bio-drum and an
elegant look which made this waterless composter at home in any bathroom.
..The Centrex was an all new Central composting unit with a Bio-drum slung side to side rather than for and aft. This allowed for a
lower profile making it easier to be fit into places where there is little headroom. In addition to the regular 1 pint flush version, this
configuration also allowed SUN-MAR to offer a waterless Central unit which featured a SUN-MAR Dry Toilet positioned directly
above the composting unit.
..In addition, the new design lent itself to being scaled up, an advantage which was to result in the subsequent launching of the
Centrex 2000 and 3000 series units
The First Composting Toilet Designed Specifically for Mobile Use
..The SUN-MAR Mobile, introduced in1994 was the first waterless, self-contained composting toilet designed for use in marine and
RV markets, and for that matter, for use in anything that moves. The key feature of the mobile unit was that at only 19" wide it could
be installed virtually anywhere.
..Other than the width, what was new in this composting toilet was the 3" vent stack with a special fan/filter box which scrubbed the
vented air so as to avoid any inconvenience on deck. In addition the finishing drawer was gasketed in place so that liquid could not
escape even during violent motion, and the footrest folded back into the unit which is only 23" deep.
..In addition a shore based waterless composting toilet was introduced with a 2" vent with a special fan assembly, and a 160 watt
heater in the base compartment. This unit, the Spacesaver, is ideally suited for installation in cupboards or small corners where a
toilet is needed but space is a problem.
The Centrex 3000, the First Continuous Flow Composting Toilet System
..In 1997 SUN-MAR unveiled the first continuous flow central composting toilet system. This meant that as the Bio-drum rotates
compost moves along and through the unit before falling automatically into a collection chamber at the end of the unit. On this unit,
the high capacity 3000, the collection chamber replaces the finishing drawer as the 3rd chamber. This unit is the highest capacity
Composting toilet system in SUN-MAR’s line and has been subject to continuous improvement since its introduction. It is available
in either waterless or 1 pint flush configurations, and in electric, non-electric and dual vented versions.
The Mid Capacity Centrex 2000
..The last new major family of Central Composting toilet systems, the Centrex 2000, was SUN-MAR’s millennium baby, born in
2000. This unit was designed as a medium to high capacity composter suitable for residential use and for heavy cottage use. In
fact its Bio-drum is so large that most families only have to remove compost on an annual basis. Despite its high capacity the 2000
is a low profile unit which fits into spaces with limited headroom. Like the 3000, it is offered in waterless or 1 pint flush versions,
and in electric, non-electric and dual vented models.
suffer from a number of weaknesses. Firstly, this composting toilet design was what we now call a single chamber unit, which
means that the operating conditions were the same throughout the whole toilet and not optimized for the different needs of
composting, evaporation or finishing. Secondly, the fact that heat was being blown in from the top meant that the compost tended to
get dried out, while the liquid in the bottom was not evaporated efficiently. Thirdly, the compost in the bottom was not isolated and
was subject to contamination from fresh waste.
..Even today, over 30 years later, some waterless composting toilets can still be found which feature a top mounted heater with all
the attendant problems this brings. However, subsequent SUN-MAR composting toilet designs have been successful in solving
the inherent problems evident in this first waterless toilet design.
The Second Generation
..In 1977, the second generation composting toilet was born. Known as the Tropic, this waterless toilet featured one highly
significant improvement;- the heater was located in a sealed compartment in the base of the toilet. This base heater was able to
evaporate the excess liquid in the base, while allowing the compost pile to remain moist, an improvement which dramatically
increased composting speed and ease of operation
..This heater arrangement therefore overcame the big problem with top mounted heaters, namely that in evaporating liquid they
also dry out the compost pile. Drying out the pile has two undesirable affects. Firstly, aerobic microbes are reduced to the point
where composting slows to a halt, and secondly the waste cakes to a consistency somewhat like an adobe brick where it
becomes impossible to agitate the pile.
The First Central Composting Toilet System was Marketed
..In 1977 SUN-MAR extended the concept of domestic composting by offering a composting toilet system that was outside and
several feet away from the bathroom, but connected to a 1 pint toilet in the bathroom. This allowed users to have a ”normal” looking
bathroom, while still having all the benefits of composting. The use of a low flush toilet meant that compost was much easier to
keep moist. However because this toilet was not waterless, it was not always possible to evaporate all the liquid. Consequently,
the small amount of excess liquid has to be handled by an old septic, recycling bed, or other approved system.
The Third Generation
..In 1979, a further major improvement was launched. The difficulty of aerating, and providing oxygen for the aerobic microbes was
solved by replacing the pile and mechanical mixers by a Bio-drum. The Bio-drum had a door which when open allowed the waste
into the Bio-drum, and when shut allowed the Bio-drum to stay sealed when rotated. This Bio-drum arrangement gave rise to a
huge performance improvement because by rotating the drum compost could now be well mixed, and perfectly oxygenated, while
also allowing the moisture to be evenly distributed throughout the compost.
..This Bio-drum had a screen in the rear, which allowed any excess liquid to drain into the evaporating chamber in the base of the
composting toilet, thus ensuring the waste did not get saturated. Saturated waste is undesirable in a composting toilet because it
dramatically slows composting down by driving out the oxygen the aerobic microbes need to survive. A saturated compost provides
good conditions for anaerobic microbes, which are slow and odorful.
..Another major benefit to the Bio-drum arrangement was that by rotating the Bio-drum backwards, the Bio-drum door would remain
open so that the compost would drop automatically into a finishing drawer. In the drawer, compost was isolated, no longer
exposed to fresh waste, and was able to finish composting while gradually drying out. The drawer could be easily removed without
exposing the user to liquid or fresh waste.
..This was the first three chamber composting toilet, where composting was taking place in the Bio-drum, liquid was being
evaporated in the evaporating chamber and compost was being finished in a finishing drawer. All these essential processes could
now be optimized, a development which gave SUN-MAR the leadership position in the field of composting toilets,- one which it has
maintained to the present day
The Advantages of a Three Chamber Composting Toilet
Some of the advantages have been described above. Hopefully repetition will do no harm!
1. The three different chambers allow for optimizing the three different requirements for composting, evaporating and finishing.
2. The Bio-drum allows compost to be properly and completely oxygenated, rather than the partial aeration achieved by composting
toilets with fixed mechanical mixers.
3. The Bio-drum ensures there is no excess moisture, since any excess is automatically drained to the evaporating chamber.
4. By being separated from any direct heat, the material in the drum does not dry out as it would in composting toilet designs where
heat is aimed directly at the pile
5. The drum offers simplicity of operation. Tumbling the Bio-drum ensures mixing is easy and complete,.( like a cement mixer or
clothes dryer)
6. Removing compost is merely a question of rotating the Bio-drum backwards. There is no concern with sealed bases, secured by
screws and thee is no exposure to liquids and flooding
7. The Bio-drum offers the ideal environment for aerobic bacteria to prosper
8. The evaporating chamber is heated by a heater below it. The advantage this gives is similar to the advantage gained by heating
a saucepan with an element beneath, as opposed to heating with a hair dryer from above.
9. The heater is on when there is liquid to evaporate and off most of the time when there is no liquid.
10. The evaporating chamber offers the ideal environment for evaporation with air being pulled by a fan over a large surface area of
liquid warmed from beneath.
11. While in the drawer the compost is surrounded by a stream of drying air, and gradually dries out prior to removal rather than
being exposed to, and contaminated by, fresh waste and liquid.
12. The drawer is removed merely by pulling it out by hand
The First Self-contained Non Electric Waterless Composting Toilet
..So successful was the 3 chamber concept that in 1981 SUN-MAR introduced the first self-contained non-electric composting
toilet. This was identical to the electric unit of its time, except for a few important differences:
1. The non-electric toilet had a 4" vent stack rather than the 2" vent on electric units
2. There was no fan on the non-electric unit, although a 12V fan could be inserted in the vent stack if additional air movement was
needed.
3. There was no heating compartment in the base of non-electric toilets
4. The non electric composting toilet had a larger drain than the emergency safety drain on electric units
This concept proved so successful that SUN-MAR’s non-electric composting toilet remains the standard for those living off the grid.
The First Non-electric Central Composting Toilet System
..In 1987, SUN-MAR offered the first Non-electric Central Composting Toilet System. This unit incorporated similar differences that
distinguished the non-electric self-contained toilet, namely a 4" vent stack with 12V fan, and no heating compartment in the base
The First Self contained Composting Toilet to Pass North American Operating Standard
..In 1989 SUN-MAR’s Excel became the first self-contained composting toilet to pass the National Sanitation Foundation (NSF)
Standard #41. This was a 6 month residential test where no odor was permitted even under overload conditions, and only a
negligible fecal coliform count was permitted in the composted output. This meant that from 1989 regulators could confidently
permit use of a waterless SUN-MAR composting toilet.
..Today, SUN-MAR composting toilets are the only such toilets listed and certified by NSF under the new updated NSF Standard
#41 (1999) for residential and for cottage use.
The First Dual-vented Waterless Composting Toilet
..In 1991 Sun-Mar introduced a dual vented self-contained composting toilet, which operated as an electric unit when power was
available, but defaulted to non-electric operation using the 4" vent stack when it was not. This model proved to be popular for those
who had no power now but were expecting it in the future; for those operating a generator for most, but not all the time; and for
those with an insecure power supply.
1993 The Compact and the Centrex are launched
1993 was a big year for SUN-MAR. At this time the Compact and Centrex models were both launched.
..The Compact was a lower profile version of the long established Excel. It had a patented variable diameter Bio-drum and an
elegant look which made this waterless composter at home in any bathroom.
..The Centrex was an all new Central composting unit with a Bio-drum slung side to side rather than for and aft. This allowed for a
lower profile making it easier to be fit into places where there is little headroom. In addition to the regular 1 pint flush version, this
configuration also allowed SUN-MAR to offer a waterless Central unit which featured a SUN-MAR Dry Toilet positioned directly
above the composting unit.
..In addition, the new design lent itself to being scaled up, an advantage which was to result in the subsequent launching of the
Centrex 2000 and 3000 series units
The First Composting Toilet Designed Specifically for Mobile Use
..The SUN-MAR Mobile, introduced in1994 was the first waterless, self-contained composting toilet designed for use in marine and
RV markets, and for that matter, for use in anything that moves. The key feature of the mobile unit was that at only 19" wide it could
be installed virtually anywhere.
..Other than the width, what was new in this composting toilet was the 3" vent stack with a special fan/filter box which scrubbed the
vented air so as to avoid any inconvenience on deck. In addition the finishing drawer was gasketed in place so that liquid could not
escape even during violent motion, and the footrest folded back into the unit which is only 23" deep.
..In addition a shore based waterless composting toilet was introduced with a 2" vent with a special fan assembly, and a 160 watt
heater in the base compartment. This unit, the Spacesaver, is ideally suited for installation in cupboards or small corners where a
toilet is needed but space is a problem.
The Centrex 3000, the First Continuous Flow Composting Toilet System
..In 1997 SUN-MAR unveiled the first continuous flow central composting toilet system. This meant that as the Bio-drum rotates
compost moves along and through the unit before falling automatically into a collection chamber at the end of the unit. On this unit,
the high capacity 3000, the collection chamber replaces the finishing drawer as the 3rd chamber. This unit is the highest capacity
Composting toilet system in SUN-MAR’s line and has been subject to continuous improvement since its introduction. It is available
in either waterless or 1 pint flush configurations, and in electric, non-electric and dual vented versions.
The Mid Capacity Centrex 2000
..The last new major family of Central Composting toilet systems, the Centrex 2000, was SUN-MAR’s millennium baby, born in
2000. This unit was designed as a medium to high capacity composter suitable for residential use and for heavy cottage use. In
fact its Bio-drum is so large that most families only have to remove compost on an annual basis. Despite its high capacity the 2000
is a low profile unit which fits into spaces with limited headroom. Like the 3000, it is offered in waterless or 1 pint flush versions,
and in electric, non-electric and dual vented models.
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