Pulsar® 30215 36/PLT 25 lb Power Shock Calcium Hypochlorite Treatment Pail. Industry’s strongest calcium hypochlorite shock treatment. Granules dissolve and activate in seconds to shock your pool and spa water and destroy organic contaminants with 78% available chlorine. Once you treat your pool with Pulsar® Power Shock, you’ll never again have to wait for those old, slow-acting standard grade granules to start working. With 92% of its granules dispersing evenly in one minute or less, there’s no need to pre-dissolve like some of the competition; or clean up stains from un-dissolved calcium hypochlorite on the bottom of your pool. You control the dosage by the amount you scoop, pour or broadcast. Pulsar® Power Shock – the convenient, fast and powerful way to shock your pool water cleanly and clearly.