This document discusses a system for purifying water through cycling. The system uses a cycle connected to a centrifugal pump that sucks in water and sends it to a reverse osmosis setup. As the cyclist pedals, it powers the pump which pumps water through a reverse osmosis membrane to filter out impurities. The purified water is then collected. The system provides a low-cost way to purify water using human power instead of electricity. It is portable and can help provide access to clean water.