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API Phosphate Kit Accuracy

583 Views 2 Replies 2 Participants Last post by  The Coffee
I'm slowly increasing my phosphate dosing but I want to at least see more or less what the level is now.

Is the API phosphate test accurate enough to measure in the 2-3 ppm range?

Also, does the kit actually expire and become inaccurate or is the expiration date just on there for kicks?
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