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.