HTH 6 lbs. Pool Care Shock Ultra (6-Pack of 1 lb.)

Shock treat your pool at least once a week to kill unwanted bacteria and algae. Shocking gives your pool the boost of chlorine it needs to keep the water clean and clear. The HTH Ultimate Benefit: HTH Ultimate Shock Treatment is a highly effective, 7-in-1 multi-purpose shock product that works fast to kill bacteria and algae and restore crystal clarity to pool water within 24-hours. It is convenient and easy to use while also preventing scale formation and softening your water. It wont over-stabilize your pool and contains Visible Blue Action - so you know it's working.