Homebuilding RO

[Wanabe1972]

I have a homebuilt RO that I have used for several years now. It has 2 4x40 xle membranes and a very anemic 140 gph pump. It also has a recirculation line. It runs the membranes in series and takes 2 percent to 6 single pass. Due to sap temp and efficiency it runs extremely slow. I just ordered a SS procon 330 gph pump. Would I do better to switch to parallel with the new much larger pump or keep it in series. It looks like due to efficiency the parallel would better. By the way I currently run around 150 psi and would like to stay in that range. Thanks Jeff

[Clinkis]

I run 2 membranes (mes 4x40’s) in series with a 330 gph procon pump and it works very well. The higher flow rates keep the membranes cleaner with less fouling.

[Greenthumb]

Sorry to jump in but can I be reminded - series plumbing vs parallel plumbing again?

[mkoehler79]

I run 2 membranes (mes 4x40’s) in series with a 330 gph procon pump and it works very well. The higher flow rates keep the membranes cleaner with less fouling.

I second the keep it in series opinion for the same reason.

[mkoehler79]

Also FYI, a 330 gph procon requires a 20 psi minimum feed pressure. If you already have a feed pump likely not an issue, if not I would recommend one.

[wiam]

Sorry to jump in but can I be reminded - series plumbing vs parallel plumbing again?

Series goes from pump to one membrane then to other membrane.
Parallel goes from pump to both membranes.

[Wanabe1972]

Yes im feeding my high pressure pump with 60 psi from a jet pump so i shouldnt have any problems there. Sounds like series it is which will be nice and easy pump swap. I wont get the pump till Wed but already have the motor, coupler and pump mounting plate set up. Should be running the new pump Wed night.

[to100]

Sorry to change subject, why if you have a high pressure feed pump do you need a Proconss 330gph pump?

[TreeTapper2]

The feed pump draws in the sap and supplies the procon pump so you don't blow it out. The procon is necessary to give you high gph. The feed pump may be able to push some sap through the membrane but it won't be efficient at all..not even close.

[jake1]

Be sure to have the plumbing option to switch from series while concentrating to parallel while flushing and cleaning. So your not cleaning one membrane into the other.