HTH Pool Care 1 Lb. Shock Ultra Granule (6-Pack)

All-in-1 weekly shock formula. Increases chlorine levels, kills and prevents bacteria and algae, reduces eye and skin irritation, prevents stains from metals, prevents scale, improves filtration, and softens water all with results in 24 hours. Traditional chlorine products contain cyanuric acid (CYA). When too much CYA builds up, it can cause overstabilization or chlorine lock, cloud your water, and cause algae growth. The fast-acting, fast-dissolving Cal Hypo based formula provides chlorination without adding extra CYA for a beautiful sparkle all season. Its ideal for all pool surfaces and will not fade your liner