I found that most phosphate test kits were unreliable.
I bought the expensive D-D phosphate test kit from J and L and I only needed to use it a few times to find out if my reef phosphate was too high (it wasn't) and to find out if my planted tank phosphate was too low (it wasn't). The other phosphate test kits I used measured zero phosphates where this phosphate test kit measured detectable phosphate levels.
If you just want to know as a one-time question whether your phosphates are too high, mail me a sample of your water and I can test it for you.
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