PoolRx+ Mineral Algaecide Unit + Booster Combo, Treats 7.5K-40K gallons for up to 6 Months, New Formula with Silver.

Eliminates and controls all types of Pool AlgaeReduces chemical demandEffective up to 12 months in pools 7.5k-20k gallons. Effective up to 6 months in pools 40k gallons.NSF/ANSI 50 Certified EPA...