In The Swim Black Algaecide – Eradicates Black Algae in Swimming Pools - Copper Sulfate Pentahydrate - 1 Quart - 2 Pack

Targets Black Algae: Effectively treats black algae in porous surfaces like concrete, plaster, and gunite.Prevention and Control: Non-foaming, non-clouding formula designed to prevent and control black algae in pools.Powerful Formula: Contains 11.8% copper sulfate pentahydrate to break down black algae and overcome its resistance to other chemicals.Quick Results: Safe to swim 24 hours after shocking, once chlorine levels drop to 3-4 ppm.Easy Application: Use 16 ounces per 10,000 gallons after super chlorination and prepping the pool. Note: Shipping is unavailable to DC, ID, MT, ND, RI, SD, UT, VT, AK, and HI due to state restrictions.