Robelle 68% Calcium Hypochlorite Powdered Shock dissolves faster! An extra-powerful start-up and maintenance shock that helps to improve the appearance of your pool by removing and preventing algae growth. When used as directed, Robelle Powdered Shock removes organic waste and raises chlorine level, producing sparkling, clean swimming pool water. Kills bacteria, controls algae, destroys organic contaminants and restores crystal clarity. This is the ideal product for a super-fast acting chlorine boost to give your pool shocking clarity
