english: Because essentially, what you're doing is you're using clean water and you're using it to flush your toilet, convey it to a wastewater treatment plant which then discharges to a river, and that river, again, is a drinking water source.
non_english: Jer zapravo koristite čistu vodu da biste pustili vodu u toaletu, koja prolazi kroz postrojenja za prečišćavanje vode koja se meša sa rekom i onda je reka ponovo izvor vode za piće.