Jack's Magic The Iron, Cobalt & Spot Etching Stuff 2 lb.

STAIN SOLUTION #1) is a non-acidic product for removing iron, cobalt, and spot-etching stains from all types of pool surfaces without draining the pool. The Iron, Cobalt & Spot Etching Stuff will normally remove these stains easily and effectively within 48 hours, with minimal rebalancing of other pool chemical products.

2 lb per 12,000 gallons of water.