Salifert PO4 tests as low as .03. PO4 level of .1 or higher can cause
serious problems with sps and lps as well as fueling nuisance algeas. I
would suggest figuring out the cause and take the appropriate measures to
reduce.

"KurtG" wrote in message
.. .

I don't think my Red Sea Phosphate test will go under .1 ppm. I've tried
it with distilled water and I still get the 0.1 ppm. It seems to be the
color of the reagent the comes out of the bottle.

Any recommendations?

--Kurt