Natural Chemistry Stain Free Extra Strength, 7395

Natural Chemistry Stain Free Extra Strength is a metal stain remover built on a blend of industrial strength ascorbic acid. It lifts iron, copper and manganese staining off pool surfaces and does it without adding phosphates to the water.

How the treatment runs

Balance the water first, then lower chlorine to at least 1 ppm. Chlorine is an oxidizer and it works directly against what ascorbic acid is trying to do, so treating a heavily chlorinated pool wastes product. With the pump running, broadcast 1 lb per 10,000 gallons around the perimeter of the pool.

Then hold the metal in solution

An hour later, add METALfree at 33.9 oz per 20,000 gallons. Removing a stain puts the metal back into the water, and without a sequestrant it simply plates out again somewhere else. Add a pulp based filter aid to a cartridge or sand filter, or make sure a DE filter is properly charged, then vacuum the pool slowly and thoroughly.

Afterward

Clean the filter after 24 hours, backwashing and recharging as appropriate for your filter type, then test and rebalance. Do not shock for at least a week. Continued weekly METALfree keeps the metal from staining again.