Hanna 713 PO4 checker(I assume that's the one you have) has an accuracy of +(-)0.04ppm. So your water out of the reactor could be 0ppm or 0.05 ppm. As long as water out of the reactor has a lower PO4 level than the tank water, then your GFO is still good.
Quote:
Originally Posted by Enigma
Hmm. 0.01 ppm out of the reactor. Is it possible to see 0 out of it?
This Hanna checker is very nice and easy to use.  |