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Old 01-14-2010, 03:03 PM   #1
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Alpine Owners Club
Join Date: Mar 2006
Location: Oregon
Posts: 348
RO water input pressure

For the reverse osmosis system
What are people using for a pump to increase the pressure from city water supply. I jury rigged a spare pump I have but it has a 30 psi. max. I thing I am making as much waste as I am potable water at this pressure. The pressure here goes from Minus to maybe 5 psi.

05 Alpine 36MDDS, 09 Subaru Forester, no animals.
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Old 01-14-2010, 07:28 PM   #2
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Location: Auburn, CA, Havasu, AZ & Mulege, BCS
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Two- you are better off that 5psi, but at 30 you are barely in the money to make water. I've tried it at 25psi, and at that rate could only make about 30 gallons overnight.

I have a 110V pump that makes about 100psi. Its a simple setup where I can bypass the pump if city pressure is good or I get tired of the diaphragm pump racket. If I'm in a hurry I shut off the bypass and plug in the pump. Pumps like this Flojet Booster pump will work nice, and run your make rate to over 20gph. Another great advantage of the booster pump is the RO reject rate for dissolved solids in the water goes way up over 98%, ie the membrane is more pollutant-efficient at higher pressures, in addition to making water faster.

You should still run the reject at about 2/3 of the input to keep the membrane well washed and long lived. You can make that adjustment if you have the flow meter set. If you have the capillary tube back pressure method it is not adjustable.

Baja-tested '08 2-slide 36'
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Old 01-14-2010, 11:26 PM   #3
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Alpine Owners Club
Join Date: Mar 2006
Location: Oregon
Posts: 348
RO water

Thanks for the info.
I have a simple system w/2 membranes. I hadn't considered the fact that if the water not very good the pressure probably isn't either. I guess I'll go back to jug water for this trip and see about a better pump when I get home.
05 Alpine 36MDDS, 09 Subaru Forester, no animals.
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