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  1. J

    Flourite Black Sand dumping GH and KH

    Hi, Facing difficulties to lower my GH and KH in my RCS 45L, I made this test: I filled half of a drink glass with Seachem Flourite Black Sand. Added RO water (KH 0.6) to fill the glass and stir it. After 3 weeks, I tested: KH 5.4 GH 8 :shock: Just shocked. Is this how my tank would go if I...
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