GreenClean Tablets are the same formula as GreenClean Granular Algaecide but in the convenience of a slow-release tablet. GreenClean Tablets eliminate algae and keep water clean, making them an ideal part of your preventative program. The tabs work through a powerful oxidation reaction, breaking down organic debris. GreenClean Tablets are an alternative to algaecides that utilize either copper or quaternary chlorides. Start the season by applying tablets to your pond early in the spring and keep them on hand to reapply all season long.