Lower chlorine to 1.0 ppm
Lower your chlorine reading to less than 1.0 ppm by either using chlorine neutralizer or abstaining from adding your sanitizer for a few days.
Lower Total Alkalinity (Optional)
Lower your Total Alkalinity by using one (1) bottle of No Mor Muriatic Acid™ per 20,000 gallons. You can add more as necessary. You can also use regular liquid muriatic acid.
Add Pool Stain Treat®
Add one (1) bottle of Pool Stain Treat® per 20,000 gallons of pool water.
After 5-10 minutes brush the walls of the pool. One good brush over the wall should be fine.