ProCon (vane) vs Gould (multistage) Pumps for RO

[mkoehler79]

Yes head pressure from the tank and sap filtered prior to going into tank to eliminate the potential for any chunks going through procon. A feed pump could still be used and may be advised, but powering the unit from a generator was my deciding factor in the configuration.

[Bricklayer]

When I was figuring out the pump curve for mine to see how many membranes it was good for I contacted weber.
I told them I was feeding the pump with 60 psi feed pump and they explained to me that their curve charts are at 0psi. So if you feed at 60 psi you take 60 psi off your desired flow rate at that psi. So if your looking at 200 psi then you look at the 140 psi flow rates on the pump curve.
I have my 1 membrane fed with a 3/4" and I can't get the pressure below 140 psi even with the recirc open and the concentrate valve wide open. And flow gauges say I'm doing 9 gpm across membranes. So I'm going to add a membrane this year in parallel to bring initial pressure down. If the pump can't keep up I will put it in series.

[Greg MacWilliam]

The procon 600 needs a positive feed pressure of at least 20 psi. I plumbed the filters in parallel and ran a return line to the intake side of the procon. The second procon will be for high pressure re circulation. Bought the motor from Harbor Freight mainly for price but it ran well.

[mkoehler79]

I would recommend adding the second membrane in series to keep your flow high through the membranes. As far as the pressure not dropping, I would look at going to a larger size concentrate valve since restriction of flow is what creates pressure. Just my two cents.

[mkoehler79]

The procon 600 needs a positive feed pressure of at least 20 psi.

Absolutely required for the larger procons!

[Cloverland Maple]

I have my 1 membrane fed with a 3/4" and I can't get the pressure below 140 psi even with the recirc open and the concentrate valve wide open.

This cause any issues when you were in wash cycle?