History and Rationale

The rationalization of Bio-Sun's patented process, "Performance Design Calculation", assembly and "Performance Warranty" culminates from almost 30 years experience with composting toilets in every type of application including a large original, Swedish design, sloped bottom fiberglass unit that was installed in the author's residence in 1975.

The first ten years experience was with more than 100 large enclosed, "passive" slope bottomed, fiberglass/ plastic containers either installed as single units or in multiples. As each unit attained approximately six years of usage large numbers of failures began to occur.

These failures were: leaking/ bulging tanks; odors from tanks and toilets and always compacted, full tanks overflowing with nearly raw wastes and liquids with no forward movement of composted material and no composting process apparent anywhere within the unit.

Employees of Bio-Sun Systems, Inc have shoveled and bucketed out more than 50 of those "passive" enclosed tank units over the past 20 years. Each time the manufacturer was contacted (especially about the full, overflowing tanks), The standard answer was—" YOU ARE NOT MAINTAINING THE UNIT PROPERLY", "YOU HAVE TO ADD AND STIR-IN MORE BULKING AGENT (WOOD CHIPS OR SAW DUST).

From our experiences, any of those passive, enclosed tank units receiving usage (40 or more uses per day or 15,000 uses per year) would require rigorous, physical turning and stirring of the toilet piles at least once per week (52 times per year). Also, the frequent removal and disposal of large amounts of liquid is required. Even then such a maintenance regimen cannot ensure that effective composting would be occurring.There is indiscernible, gravity movement of solids down the floor of the sloped bottom tanks.