Algae Control Pond by Tetra $10.99 8.4 oz - $10.99 16.9 oz - $17.99 Size 8.4 oz 16.9 oz 1 2 3 4 5 6 7 8 9 10+ Quantity Quantity We are currently experiencing temporary outages for select pet products due to vendor shortages out of our control. We may contact you after placing your order to make substitutions or to update you on your order. We apologize for any inconvenience this may cause you. Add to cart Removes green algae in pond water fast. Tetra® AlgaeControl™ effectively combats algae blooms (green water), string and hair algae (Spirogyra) and blanket weed (Oedogonium).For use with, when used as directed: Ornamental ponds with plants, Ornamental ponds with ornamental fish and fountains.