Build log: the composting toilet
No black tank. Here's the actual trade.
No black tank. Here's the actual trade.
The toilet is the upgrade people ask about most and admit to least.
How they work: they separate liquid from solid. That separation is the entire trick — mixed waste is what smells. Solids go into a chamber with a dry medium (coco coir or peat), a small fan vents continuously, and the result is genuinely not offensive.
What you gain: no black tank, no dump station, no sewer hose. No water per flush — meaningful when you're hauling every gallon. Freedom to stay put longer; the limit becomes food and water, not tank capacity. No freeze risk in a black tank.
What you trade: the liquid emptying routine. Solids periodically. A small fan on continuous 12V — tiny, but it's a 24/7 load. Higher upfront cost. And venting has to be installed properly or odor control fails.
The honest verdict: for full-time use, most people who switch don't go back. For occasional weekends, a standard toilet and a dump station is simpler and cheaper.
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