2 membranes ro-di

[Beam]

hello

few month ago, I had a big problem with dyno's and algae, I identified that the cause was probably my water. I use a Ro-di, and my tds is at zero at the exit, but I know that my water is not top notch despite everything (ICP test)

it was suggested to me to add an extra membrane to my ro-di.
not to recover the waste water, but to make the good water pass through a second membrane.

i have an aquatic life smart buddy booster pump, but i wonder if there will be enough pressure at the outlet of the first membrane to produce water with the second one?

has anyone ever done this?

thanks

 

[T-J]

I have horrible city water (500tds) and have a single membrane RODI that ICP tests out just fine.
What did the ICP test show on your RODI water?
Also, to answer your question, I know some people run two membranes. Not sure on the pumps they might use. I'm fortunate enough to not need a pump on my system.

 

[KStatefan]

You will have trouble with just running them in series. For the membrane to work properely you need a pressure difference across the membrane and there will not be enough flow coming into the second membrane.

 

[BZOFIQ]

I run 2 membranes in series with booster pump at 90 PSI....but my TAP TDS is almost always less than 40.

I don't recommend connecting in series to anybody with incoming TDS in the 100s.