For 50 years, fishkeeping enthusiasts have looked to the Tetra name for products and solutions that add ease and beauty to their home. Whether you're an experienced hobbyist or just starting out, Tetra has everything you need–-from a large variety of quality fish food and innovative equipment to test kits and decor. TetraPond AlgaeControl removes green algae in pond water fast. Tetra AlgaeControl effectively combats algae blooms (green water), string and hair algae (Spirogyra) and blanket weed (Oedogonium). This product can be used in fountains and ornamental ponds with plants and ornamental fish when used as directed. Apply the dosage in the morning. Dislodge string algae off stones with high pressure nozzle and scoop out with a fine mesh net or pond vacuum. Figure out the correct dosage according to product label. Dedicate use of measuring cup to algaecide applications only. Dilute the proper dosage in a bucket of pond water. Pour diluted mixture into the pond evenly along the edges. Do not overdose. Repeat if needed every three days up to three total doses. Remove dead algae from pond and do a partial water change. Do not use in ponds established for less than three months.