{"product_id":"strain-free-extra-strength","title":"Natural Chemistry Stain Free Extra Strength","description":"\u003cp\u003eNatural 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.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eHow the treatment runs\u003c\/strong\u003e\u003c\/p\u003e\u003cp\u003eBalance 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.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eThen hold the metal in solution\u003c\/strong\u003e\u003c\/p\u003e\u003cp\u003eAn 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.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eAfterward\u003c\/strong\u003e\u003c\/p\u003e\u003cp\u003eClean 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.\u003c\/p\u003e","brand":"Natural Chemistry","offers":[{"title":"Default Title","offer_id":48634375667924,"sku":"NAT-50-972","price":45.99,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0801\/9568\/2516\/files\/default_cfac0ff2-2d8e-49f2-8fd6-5680f1ed4a06.png?v=1788828731","url":"https:\/\/www.activepoolsupply.com\/products\/strain-free-extra-strength","provider":"Active Pool Supply","version":"1.0","type":"link"}