Shock treat your pool at least once a week to kill unwanted bacteria and algae and to give your pool the boost of chlorine it needs to keep your water clean and clear. The hth Super Benefit: This is an effective shock product that kills bacteria and algae and restores crystal clarity to pool water within 24 hours, reduces chlorine odor and eye irritation caused by swimming pool water and won?t fade liners. It is convenient, easy to use, and won?t over-stabilize your pool.