I built a composting toilet for my house, and I used a Separett Privy 500 seat for it. The toilet has been very successful, I was careful to make it as airtight as possible (except for the vent) by sealing all the joints with mastic, and I’ve had no trouble with flies or other insects and no noticeable smells. The seat is fine but if I was doing it again I would go for the plastic version rather than the polystyrene version as it would be easier to clean.
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