I am specifically interested in removing stains from a plaster pool that nothing else has been able to remove.
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This stuff is not cheap but it beats the price of an acid wash an refilling the pool.
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Regards.
------------------------------------------------------------ --- I wish I had a straight forward answer for you but I don't. My pool is vinyl lined with one set of spa steps. Years ago I had a terrible time with stains. After trial and error I discovered the best way to handle stains was to "convince" the stuff to appear inside my filter media. I used Jack's alternative to DE along with DE and every two weeks I would flush out the fingers of the DE filter. Those fingers were dark brown but after a power wash they became bright white. Next swim season all was well.