Used to chlorinate and shock water clear. Works in about ten minutes. Chlorine is 15% by volume. Made in the U.S.A. 1 gal.

Additional Information
Twinco Ultra Shock is a powerful treatment with more of the benefits pool owners look for. Works extra fast to combat algae and bacteria. It dissolves more quickly and completely and keeps pool water sparkling clean and clear with less work. 1 gal.