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BRS Tested Some Carbon Blocks: I'm Testing Them, You Should Too.
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02/15/2018, 03:50 PM
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Buckeye Hydro
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Join Date: Sep 2006
Location: Cincinnati, Ohio
Posts: 4,857
Doesn't matter if its 2 ppm or 20 ppm going in - you'll get TDS rising in the effluent through long before the entire cartridge changes color.
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