I really don't think that not rinsing your food with RO
or using pellets have gotten you to 5ppm. I don't rinse my food at all, and use flake AND pellets every once in a while, and have no detectable phosphates. Granted... I run GFO
, but my phosphates were only barely measurable (0.03) before I started running it.
Just to echo what hippoguy asked... when was the last time you checked phosphates and what were they then? Is this the first time you've checked for them? And what brand test are you using?