Keep your swimming pool water clear in just minutes with Poly-Guard 4-Pack 1 Gal Ultra Shock Treatment. This highly concentrated bleach formula chlorinates and shocks the water clear in about 10 minutes. Each bottle contains a circumvented liner to prevent odor during transport and storage. Consumer-friendly 4-pack in a heavy-duty case with handles makes it easy to carry and helps prevent damage. Use ultra shock pool treatment for superior results in just minutes!