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BioGuard Algae All 60 Non Foaming Pool Algaecide Brand_HydroQuip and Marino and Marino especially a fresh dose of Spa Marvel Water Treatment & Conditioner Most pool chemistry loses effectiveness as pH drifts — chlorine in particular becomes dramatically weaker above 7 BioGuard Algae All 60 is a 60% polymeric quat algaecide — the highest concentration of polyquat in the BioGuard line — and it's the product BioGuard specifically recommends for pools with attached spas or jetted returns
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