This pool trine 50 is a cost-effective and preventative algaecide. Effective against green, blue/green, mustard and black algae. Keeps water free of green and yellow algae and clarifies swimming pool water. Compatible with chlorine, bromine and biguanide sanitizers. Initial application for vacuum algae debris to waste and thoroughly brush pool, add 5-1/4 ounces of this product to each 10,000 gallons of water or ratio thereof, add this product directly into pool by pouring around entire outside perimeter of pool, vacuum pool after 24 hours to remove dead algae. If algae is still visible repeat dose (steps 2 and 3) as necessary until pool is free of visible algae. Once algae is under control, clean filter and return to normal operation. Maintenance dose, add 1-1/4 fluid ounces of this product to 10,000 gallons of pool water, vacuum pool after 24 hours to remove dead algae debris. If visible algae are present or re-appear, repeat this treatment procedure as necessary. When pool is free of visible algae, use the recommended maintenance dose. Maintenance dose should be added weekly. If high temperatures prevail or pool has unusually heavy use, add maintenance dose more frequently. Maintenance dose should be added after a heavy or prolonged rainfall. Product contain 32-ounce.