HTH Algae Guard 30 Algae Control 38 Oz. (Pack of 6)

Concentrated algae control formula that effectively kills and prevents stubborn green, black, and mustard algae. Add this non-foaming, fast-acting algae control directly to your swimming pool water and swim just 15 minutes after. Compatible with all swimming pool types. For best results, use with HTH shock products. Online purchases are in packages of 6.