RO/DI question

[Treebeard]

There are three particle and carbon canisters, followed by the RO membrane and three DI resin canisters. I think the resin is supposed to change from green to brown when it is exhausted, but it always has looked brownish to me.

I am not sure about the flow restrictor. I ordered the replacement membrane from the same place I ordered the system, so I would assume he would send the correct replacement membrane. The restrictor is adjustable, but even setting it wide open in flush position, there is still water coming out the clean water line. With the old membrane opening it all the way would result in zero output. Closing it all the way would result in maximum output with dirty water.

I cannot recall what the tds is of the raw water, but I am guessing it is around 50ppm. I will check it at lunchtime.

Originally Posted by hillegom

Do you mean you have 3 DI resin canisters in addition to a particle and carbon canisters?
Depending on the type of membrane you have, the carbon protects the membrane from chlorine. Some DI resins change colour when exhausted, so it is easy to see how close to the end you are.
The flow restrictor has to be matched to your membrane, ie a 100 gpd membrane has a different restrictor than a 50 gpd unit.
What is the tdi or your feed water?