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Home > Pool Products > POOLIFE POOL CHEMICALS > POOLIFE Super Black AlgaeBloc Granular, 2lb - $8.49 POOLIFE Super Black AlgaeBloc Granular Useful Tips: Effective treatment against black algae. For white plaster pools only. Active ingredient: 99% trichlor Granular. POOLIFE Super Black AlgaeBloc Granular, 2lb - $8.49 52403Regular price: $11.04 Sale price: $8.49 Qty: