Jacks Magic's The Ionizer Stuff provides pool owners utilizing copper sanitizing systems, either electronic or catalyst, to effectively prevent copper staining on pool surfaces. The Ionizer Stuff also gives pool water crystal clarity and a soft feel that swimmers love, while adding none of the nasty side-effects some anti-stain treatments leave behind. For a simple yet efficient stain preventer designed specifically for copper sanitized pools, the choice is simple: Jacks Magic's The Ionizer Stuff. Product Dosage 16 fl oz per 10,000 gallons of water.