Quote:
Originally Posted by Treebeard
I just realized that my Salifert PO4 and NO3 test kits were past their expiry dates, like 3 years past. Does anyone know what happens to the accuracy of these kits as they age? Do they tend to test high or low?
Since I need to replace them also wondering if I should switch to Elos.
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Chemically, they should read low. But depends on the compounds present in the tests and might test high too.