Produces remarkable pool cleaning results. Use before adding an EPA-registered chlorine which rids pools of green, yellow, brown, and pink algae.

• Amazing results typically occur in 24 hours.
• Results regardless of cyanuric acid levels.
• Can be used in all chlorine pools, even salt!
• 21 oz. package will treat up to 10,000 gallons.
• Add 2 lbs. of Shockwave/Refresh products or 2.5 gallons of liquid chlorine to the pool 5 minutes after adding Stop Yellow.