Quote:
Originally posted by renogaw
i use salifert's test kits, and i've gotten phosphates while testing my food before rinsing, but i never have phosphates in my tank. have you used both your tester and salifert's and received different results?
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Yes. Salifert will read zero when there is phosphates that the Hanna can detect (the salifert kit is not sensitive to low amounts, it can only detect when there is a lot of phosphates). The Hanna meter is a colorimeter that measures color changes the eye can't detect. The point being that if you test your water with Salifert and get zero, you don't really have zero phosphates. Not a big deal with softy tanks, but can be a big deal with acros.