HTH Pool Care 5.5 Lb. Shock Treatment Granule

The original swimming pool shock designed to boost chlorine levels and kill bacteria and algae for a clean, clear pool.

Traditional chlorine products contain cyanuric acid (CYA).

When too much CYA builds up, it can cause overstabilization or chlorine lock, and cloud your water.

The fast-acting, fast-dissolving Cal Hypo based formula provides chlorination without adding extra CYA for a beautiful sparkle all season.

This pool shock is great for all pool types and will not fade your pool liner.