ALGAECIDE 60 - A non-foaming, non-metallic 60-percent strength polyquat algaecide that is ideal for preventing the growth of green, black and mustard algae. Well suited for all-around use in pools with attached spas and water features. The strongest made. **$2 REBATE IF PURCHASED ALONE - $12 REBATE IF PURCHASED WITH 25 LB OR 50 LB REGAL CHLORINE TABLETS**