does your rodi unit remove all phosphate
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shifty51008
12-5 Chiefs record
What test kit are you using?
I dont get any po4 from my rodi using a hanna checker
I dont get any po4 from my rodi using a hanna checker
shifty51008
12-5 Chiefs record
Are you takeing the water straight from the rodi unit to the hanna culvett or getting the water from a holding container before the culvette?
Chris Lakies
Active member
I have the same issue. Not sure what to do. All filters fairly new and getting 60 psi right before the RO membrane. Not sure if i need more pressure? FYI im running dual DI and getting about .05.
I just put in a BRS deluxe system and bought a Hannah checker a week ago. Checked the RO water as an experiment/practice run with the checker. Came up 0.
My system is well water in, whole house sediment filter, booster pump (85-90 psi), standard three premembrane canisters, RO membrane, 2 canisters color changing DI resin. I added an additional TDS meter to the one that came with the set-up. I have TDS 226(ish) going in to first premembrane cannister and 237 Coming out of the the last canister before going in to the membrane. I find this odd and thought that I must have reversed the probes. Must have checked it 5 times. If something is reversed it is inside the TDS meter. But I digress.
TDS out of the RO membrane is 7 (approx. 97% rejection rate). Coming out of second DI canister is 0. Membrane is listed at 75G per day. Calculated production is somewhat higher than that but I do not have my notebook handy. Waste water to product ratio is 2.8:1.
Instructions with the BRS system seemed minimal but I followed what they sent and it has been prefect for the first 50 gallons of product.
Sorry for the BRS review on your thread but it is the kind of information I would want if I was having problems with a relatively new system. Good luck.
Mc
My system is well water in, whole house sediment filter, booster pump (85-90 psi), standard three premembrane canisters, RO membrane, 2 canisters color changing DI resin. I added an additional TDS meter to the one that came with the set-up. I have TDS 226(ish) going in to first premembrane cannister and 237 Coming out of the the last canister before going in to the membrane. I find this odd and thought that I must have reversed the probes. Must have checked it 5 times. If something is reversed it is inside the TDS meter. But I digress.
TDS out of the RO membrane is 7 (approx. 97% rejection rate). Coming out of second DI canister is 0. Membrane is listed at 75G per day. Calculated production is somewhat higher than that but I do not have my notebook handy. Waste water to product ratio is 2.8:1.
Instructions with the BRS system seemed minimal but I followed what they sent and it has been prefect for the first 50 gallons of product.
Sorry for the BRS review on your thread but it is the kind of information I would want if I was having problems with a relatively new system. Good luck.
Mc
OK. Just checked. Source water from well testing at 0.16 ppm phosphate and 4.0 on nitrates. Nitrate were our only source of concern the last time I had the well water checked at a university lab.
Rechecked RO/DI at 0.00 phosphate and <0.25 Nitrate. (That is as low as my Lamotte test kit goes).
Mc
Rechecked RO/DI at 0.00 phosphate and <0.25 Nitrate. (That is as low as my Lamotte test kit goes).
Mc
I am new to all of this. Is it possible that the membrane has a tear or that water can leak around the membrane? Channelizing through the RO/DI resin? TDS creep from testing the first few minutes of product water? Checking phosphate after each stage might reveal something. I would be interested in the level leaving the RO membrane before you hit the DI resin.
Somebody would probably know what each level should be. If necessary, I can run the same tests to compare to yours.
Mc
Somebody would probably know what each level should be. If necessary, I can run the same tests to compare to yours.
Mc
