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Urine Diverting Conveyor Toilet

The urine diverting BTW (behind the wall) conveyor toilet seat is the key device that makes Toilet Tech Solutions toilets perform so much better than their mixed waste (non-diverting) counterparts. Our toilets are waterless and doesn't require power or bulking agent of any kind. We provide complete toilet kits which include a BTW toilet seat, a white riser (throne), toilet building, and waste vault.

BTW Urine Diverting Seat

BTW Toilet Seat

The BTW (behind the wall) seat diverts >99% of urine away from solid waste (poop, toilet paper, and trash). Urine is plumbed to onsite treatment then to a leach area. Solid waste is conveyed up a foot-powered belt and drops into a behind-the-wall earthen-bottom vault (the Decompose) or into a container or bag (the Waste Away). A heavy-duty white plastic riser is included with the BTW urine diverting conveyor toilet.



Site Suitability:               

Solid Waste Systems:        

Compatible Structures: 

Specifications Sheet:

 >99% urine diversion; men can stand and pee; very robust; commercial strength

 Could be damaged by an explosive; may not be ideal for urban parks with vandals

 From extreme back-country environments to front-country climbing areas

 Decompose and Waste Away


 BTW Urine Diverting Seat Specifications PDF

 BTW Riser Specifications PDF

Importance of Urine Diversion

Urine diversion or source separation of urine is the critical component in the development of a low cost, low odor, low waste volume system. Providing drainage of blackwater from the bottom of a pile of soaked feces is not urine diversion. When fecal waste has been saturated with urine, the urea in urine changes to ammonia, and prevents all bacterial and invertebrate life from decomposing the pile, and makes the waste soggy and smelly (avoid this). 


The BTW seat diverts >99% of urine directly to an on-site septic field for treatment and disposal. This leaves the solid waste primarily comprised of dry low-density toilet paper and some feces. This high cellulose feedstock can be consumed (actually ingested) by bugs (worms, nematodes, slugs, and other insects). Passing through the gut of the bug, the majority of pathogens are destroyed and the waste is highly stabilized, odor eliminated, and volume diminished. TTS' Director, Dr. Hill, did his PhD work on this topic, references here.

What's in Urine and How is it Treated and Dispersed Onsite?

Urine is largely sterile when leaving the body, has high levels of plant nutrients, almost no heavy metals, flows by gravity, and self sanitizes when stored for 2-3 weeks. Fecal matter contains pathogens, metals, and has few plant nutrients, and is sticky. Of great importance to the backcountry manager, 70-90% of human waste volume and mass is urine. BTW systems divert urine away from fecal matter at the source (no mixing) so that pure urine can be stored or treated and disposed of immediately by a conventional gravity-fed septic field/leach field. This eliminates the vast majority of waste with little effort on the part of park management. Only 100-200 ml of urine are generated each use, so even at a high use toilet, used 100 times a day, less than 5 gallons of urine will be produced. This is 200x less than the standard residential septic field receives and processes. As such, the urine septic field for remote toilets can be quite short and still be conservatively over-sized. Depending on the soil type, the length can be as short as 10' long and 1' wide. 

BTW How It Works
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