Help clear up green or cloudy water caused by gravel and other floating particles quickly and safely with API Accu-Clear Freshwater Clarifier. Specifically formulated for freshwater aquariums, this liquid clarifier combines tiny particles together to form larger clumps so they can settle at the bottom or be removed by your aquarium filter. Water should clear within several hours. If cloudiness persists, another dose can be applied after 24 hours. Doses can also be administered weekly as part of your routine maintenance. So, help your finned friends see clearly with API's Accu-Clear!