HTH Advanced 3" Chlorine Tabs, 25 lb.

HTH, 25 LB, 3", Pool Care Chlorinating Tablets Advanced, Sanitizes Pool Water, Stabilized, Sun Protected, For Extended Chlorine Life, For Use In Simmer Or Floater, Protects Against Bacteria & Algae Growth. Active Ingredients: Trichlors-S-Trazinetrione 93.6%, Zinc Sulfate Monohydrate 3.5%, Other Ingredients 2.9%, Available Chlorine 84%.