Long-lasting algaecide kills green, mustard, and black algae. One-half gallon of poly-plus formula treats 20,000 gallons of pool water. Will not foam, cloud, affect metal equipment, or attack chlorine residual.
Solid covered pools:
1/2 gallon WINTERTRINE per 20,000 gallons of pool water
Mesh-covered or uncovered pools:
1 gallon WINTERTRINE per 20,000 gallons of pool water. Shake container well and pour the proper amount of WINTERTRINE around the entire pool perimeter. Continue circulation of pool water for 6 hours to ensure proper distribution of WINTERTRINE.