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Discussion Starter · #1 ·
I made the mistake of dosing powder form pH down into my old tank and now no matter how many WC or phosphate removal pads i put into the filter, its still at a very high level.

I've taken a sample of my supposedly inert substance (Onyx Sand) into a bowl and put some tap water into it. Measures 0ppm of phosphate at first, after a few days its >20ppm.

Is my tank done? do i need to use my filter material / substrate to remove phosphate completely?
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