Green Treat has the firepower to kill green algae. Green Treat is an EPA registered patented Algaecide designed specifically for green swimming pool algae. Its powerful formula has the strength to fight green algae in every type of swimming pool. This environmentally safe and powerful product is easy to use; simply add 1 bottle per 20,000 gallons of pool water and super-chlorinate – then watch your swimming pool green algae disappear. We always recommend that you follow and algae treatment with No Mor Problems to keep algae from coming back and to keep your pool crystal clear all season long.