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    Metal stain that won't go away on plaster

    Hi folks, Looks like a great forum. Thanks in advance for the help. Pool: Indoor, 13,000, Cartridge, Frogger system (low CL), Heater, I can not bypass the filter and heater. Chemistry originally: CL .8, PH 8, Adj tot Alk 107, Hardness 200 I've got metal stains (clorine test won't...