Want to install a composting toilet upstairs or in a basement? You can! The best solution for installation below/above the ground floor is a self-contained zero leachate system.
If you have a urine-collecting system in which urine is gathered in a container separate to the composting chamber, you will need to dispose of the urine manually once your container is full.
Additives help you maintain microbial activity within the pile, speed up decomposition, balance out pH levels, prevent fly strike, negate damaging effects of pharmaceuticals on the compost, and generally prevent problems from arising.