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The $7 Aquarium Pharmaceuticals (AP) test kits for NO3 and PO4 are more than adequate for our needs. The worst thing that came out of the PMDD craze was the obsession with test kit precision. The AP kits may be a bit less precise, and even that is arguable with that weird 4.4 multiplier thing LaMotte uses, but the AP kits are every bit as accurate.

IMO,

TW
 
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