PoolRx+ Mineral Algaecide 4-Unit Pack, up to 6-Month Algae Control, for 400-1,000 gallons, Purple & White, New Formula with Silver.

Eliminates and prevents all types of Spa AlgaeEffective for up to 6 Months3 Active Ingredients Copper, Silver and ZincReduces chemical demandEPA registered and NSF/ANSI 50 Certified