jeffbrig
Premium Member
I would suggest that everyone take a few minutes to look over their RO/DI (or a diagram) and really understand what it's doing and what each valve is there for. After that things will make a lot more sense to you.
The "DI" valve is a DI Bypass. It takes product water after the RO membrane and dumps it straight into the drain line. Essentially, your membrane is producing RO water, but you're discarding it.
The "FF" valve is a fast flush. It simply bypasses the flow restrictor on the dirty side of the RO membrane. In theory this high flow helps flush whatever may be caught by the RO membrane.
My Typhoon III produces 0-1tds water from the RO membrane (I have low TDS to begin with, 35-40). Every time I turn it on, the initial RO product water shows 25+ tds for the first minute or so. From what I understand, this is normal for a unit that is left sitting for several days. Not a big deal, but why use up the DI processing unnecessarily dirty water?
To combat this, I open the DI bypass line, allow it to discard the initial dirty water. Then I open the output line that goes to my tank and close the DI bypass. The RO-output TDS drops to 0 or 1 in just a few seconds. Only very rarely have I touched the FF valve, mainly because I'm not convinced it's critical (like AZDesertRat said above).
My 2Ã"šÃ‚¢
The "DI" valve is a DI Bypass. It takes product water after the RO membrane and dumps it straight into the drain line. Essentially, your membrane is producing RO water, but you're discarding it.
The "FF" valve is a fast flush. It simply bypasses the flow restrictor on the dirty side of the RO membrane. In theory this high flow helps flush whatever may be caught by the RO membrane.
My Typhoon III produces 0-1tds water from the RO membrane (I have low TDS to begin with, 35-40). Every time I turn it on, the initial RO product water shows 25+ tds for the first minute or so. From what I understand, this is normal for a unit that is left sitting for several days. Not a big deal, but why use up the DI processing unnecessarily dirty water?
To combat this, I open the DI bypass line, allow it to discard the initial dirty water. Then I open the output line that goes to my tank and close the DI bypass. The RO-output TDS drops to 0 or 1 in just a few seconds. Only very rarely have I touched the FF valve, mainly because I'm not convinced it's critical (like AZDesertRat said above).
My 2Ã"šÃ‚¢
