I test with the hanna and a Milwaukee.and what your using to test the phosphates with
just curios.....
did you test the water right after your RO/DI ? then was "0" ?
did you test the water from your make water container b 4 mix. the salt ? then was "0" ?
did you mix. and make the water around 77F temp. ?
Thank You.
When I said "0" I refer to PO4 ppm not TDS.
Ro Di 0
Container 0
Temp was 76 but temp for me doesn't matter since my test kit compensates
And my two Refractometer and phosphate kits are on target
why do you have such a massive RO? is your water wine or something?