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Two years ago I tested 4 phosphate test kits. Two turned out to be unusable and a third wasn't much better. One was fine.
The resuls of the test here at APC, at http://www.aquaticplantcentral.com/...9719-comparison-four-phosphate-test-kits.html
Bill
The resuls of the test here at APC, at http://www.aquaticplantcentral.com/...9719-comparison-four-phosphate-test-kits.html
Bill
