I got an API phosphate test kit but it consistently reads my filtered water and tank water at .25, no matter what. I've heard this is a common problem, is the test kit faulty? What's a better one, and reviews on this product?
I certainly don't have experience with those types of filters but I wouldn't be surprised if your reading is normal. It's quite complicated to able get pure water. .25 is pretty low imo but hopefully someone with experience with these filters can give you better input.
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