I’ve been using a 5 stage RO/DI system with a dual membrane installed in series. Both membranes are 50 gpd. I’ve used the system about 6 times over the course of a couple of months, making about 10 gallons or so each time. TDS before RO is about 260, and after both membranes, and before DI, 7 TDS. Up until now I’ve had 0 TDS from my product lien but today I noticed I’m getting a 1TDS reading.
I thought perhaps the dual membranes were burning the resin faster but 7 TDS before DI doesn’t seem too bad from what I’ve read online.
Any thoughts on what’s going on? I’m new to RO/DI so hope I've not made a any mistakes!
I have an inline HM TDS meter and the flow restrictor is 450. This is the flow restrictor that came with the system but when I ordered the second membrane it came with a lower restrictor (I think 300) and I was unsure which to use.
I thought perhaps the dual membranes were burning the resin faster but 7 TDS before DI doesn’t seem too bad from what I’ve read online.
Any thoughts on what’s going on? I’m new to RO/DI so hope I've not made a any mistakes!
I have an inline HM TDS meter and the flow restrictor is 450. This is the flow restrictor that came with the system but when I ordered the second membrane it came with a lower restrictor (I think 300) and I was unsure which to use.