ANOTHER homemade RO

[Msboucha]

RO is up and running with sap. At 120 psi, i'm getting about .65L/m concentrate and .35L/m permeate. Concentrate is just under 5%. Any suggestions ??

Going back to my original comment, I would suggest you try putting all your membranes in series. You could also increase the PSI a bit. I run more like 150psi with 4x400GPD membranes in series and see more like .60 lpm permeate / .20 lpm concentrate. On average I'd say I take the sap from 3 to 9. You start going above 9, and you will see the membranes start to foul and slow down.

[DavidSetness]

I have built a similar system with 150gpd membranes and played with different arrangements. My best and most consistent results came from all three being in series.

[Big_Eddy]

RO is up and running with sap. At 120 psi, i'm getting about .65L/m concentrate and .35L/m permeate. Concentrate is just under 5%. Any suggestions ??

Hmmm - My evap boils at ~16 GPH.

The RO is processing a litre of sap a min or ~16gph as well.
If you start with 100 gallons, run the RO for 6-7 hours and reduce it to 65 gallons - now what was going to be a 7 hour boil become a 4hr boil.
If you light the fire ~ 3 hours after starting the pumps, you should be done at the same time.

And it only gets better if you run in series and the concentration increases.

For $600 invested - sounds like something I'll look into more.