0.02 PO4 in RODI help

[nbd13]

Hi,

I have a 6 stage BRS with an add on Chloramine monster. I change out the DI resin when TDS gets to 1. I just changed all the filters out (carbon, sediment, Chloramine monster, RO membrane, DI resin) last week.

I get 5-6 TDS before DI and then 0 after.

I checked and I’m getting 0.02 PO4 on Hanna ULR.

Where can this be coming from? How can I fix it. I’m dealing with large amount of PO4 in my tank 0.4 and I know the RODI at 0.02 isn’t high, but still shouldn’t be that.

 

[Spare time]

0.02 is within the margin of error on that test kit assuming it is the ULR phosphate. I believe it is a +/-0.03 error range

 

[homer1475]

Only test kit I know that can measure that low is a Hanna URL. Take into consideration that your tester is meant for SW, not FW.

Not even sure if you measure FW if you can get a test result worth using.

But also as already mentioned, .02 is well within the testers margin of error.

 

[nbd13]

God point. I’ll mix up so fresh salt water and see what that reads.