"BIOLAB" SHOCK XTRA BLUENo matter what size or type of pool you have, there"s an Aqua Chem shock product that"s the right choice to destroy undesirable contaminants and leave your pool water crystal clear.The shock that gets you back in the pool extra fast, Shock Xtra Blue quickly kills bacteria and algae with added ingredients to clear cloudy water. So you get sparkling, pH balanced water that"s ready to swim in as soon as 15 minutes after treatment.Highlights:-Shock and swim in as little as 15 minutes. Kills bacteria and algae with added ingredients to clear cloudy water. Creates sparkling water. For use in all pool types. Reduces chlorine odor and eye irritation. Will not increase ph. Pack contains five 1 lb. Pool shock. Shock xtra blue. Pool chemicals. Bag.