But this DIY rainwater flushing toilet from the UK is about as low-tech and effective as it gets. Using an upstairs balcony to house a barrel cistern; a simple gauze filter system; some charcoal ...

This transfer can happen through gravity alone if the cistern sits higher than the main water inlet, but this isn’t usually the case. A well pump is often needed to pressurize the water.

Buying toilet cisterns. One can buy cisterns separately. At Nakasero, a ceramic cistern costs Shs35,000. The whole unit goes for Shs150,000. A plastic cistern costs Shs35,000.