Instructions to remove black cobalt in fiberglass and copper staining on plaster:
- With the filter off, add 1 quart of per 10,000 gallons of water in the area where the staining is the most severe.
- Turn the filter on and let it run for 8 hours after treatment (or overnight). If stains persist after 72 hours, repeat treatment.
Pool Maintenance Dose:
Add 8 ounces weekly per 10,000 gallons of water.
Fiberglass Spas:
Add 2 ounces per 500 gallons of spa water. Circulate the spa water for 5 minutes. If stain persists after 48 hours, repeat treatment.
Spa Maintenance Dose:
Add 1 ounce weekly per 500 gallons of spa water. Maintain pH level between 7.2-7.6.