GLB 71104A-04 Algimycin 2000 Algaecide for Swimming Pools (4 Pack), 1 Quart Effective against all algae types Initial dosage to prevent algae: add 8-12-ounce per 10,000-gallon Maintenance dosage (weekly): add 4-8-ounce per 10,000-gallon To treat existing yellow or green algae: add 16-to-24-ounce per 10,000-gallon to a pail of water and distribute Active Ingredient 20%: Poly [Oxyethylene (Dimethylamine) Ethylene (Dimethylamine) Ethylene Dichloride]Other Ingredients: 80%