I had the same issues a while back and switched to Rowaphos, it is an iron based product. This product is a little more expensive, but it works really well.
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Rebuilding....
Concept Custom 50gal 24x24x20, herbie overflow, Radion g2, 20 gal sump, Bubble Magus NAC 7, MP10 WES, Speedwave 1320 return.
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