I have the expensive phosphate test kit from J & L, I think it is called Merck D & D, it cost about 70 bucks.
I found other PO4 test kits were unreliable.
I rarely need to test phosphate, I find you need to test it once to see if you have a phosphate issue or not. Kind of expensive to buy a $70.00 test kit that you will use once only.
If anyone needs their phosphate tested they can send me a sample as long as they are willing to add to my collection of macroalgae by sending me some macroalgae along with their water sample.
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