Is 80psi to high for RO/DI unit?

skeeter_ca · 03/01/2015, 01:32 AM

I just finished rebuilding my RO/DI system. New filters, membrane, DI resin, pressure gauge, dual inline TDS meter, RO flush valve and RO line drain. Looks like everything is working great. With the pressure valve on the line I now see that my water pressure is 80psi. I have read that water pressure needs to be above 50 with 65 being best.

Is more a problem?

logan 12 · 03/01/2015, 02:42 AM

It would be best to check with the membrane manufacturer to see what is required as far as membrane pressure is concerned. I believe most membranes are rated up to 80psi and it is important to run the membrane at the required pressure so you get a good Flux and the desired GPH the membrane is said to produce.

Raul-7 · 03/01/2015, 06:14 AM

No, some membranes have a maximum of 300PSI. The DOW 75GPD can handle up to 150. Higher PSI means more GPD and better rejection rate. However, the housings are limited to 125.

mcgyvr · 03/01/2015, 08:45 AM

80 psi is fine..
You could lower it a bit though if you are worried. Might help save you a bit on your water bill too..
Just find the pressure regulator at your house and adjust the bolt.

Raul-7 · 03/01/2015, 04:36 PM

High pressure = more water saved.

azjohnny · 03/02/2015, 04:37 AM

You can run the water pressure as high as you want as long as the canisters and fittings can handle it. I run mine in excess of 100psi

cryptic_grower · 03/02/2015, 05:02 AM

80 is good to go IMO

03/01/2015, 01:32 AM	#1
skeeter_ca Registered Member Join Date: Dec 2003 Location: Yucaipa, CA Posts: 1,007	Is 80psi to high for RO/DI unit? I just finished rebuilding my RO/DI system. New filters, membrane, DI resin, pressure gauge, dual inline TDS meter, RO flush valve and RO line drain. Looks like everything is working great. With the pressure valve on the line I now see that my water pressure is 80psi. I have read that water pressure needs to be above 50 with 65 being best. Is more a problem? __________________ skeeter - It is easier to ask for forgiveness than premission. My motto to my wife. Current Tank Info: 75rr,6"dsb,refugium,auto top-off & semi-auto water changer, OM squirt. 4 MJs 1200, Started on 03/03/06

03/01/2015, 02:42 AM	#2
logan 12 Registered Member Join Date: Jan 2007 Location: Mahomet IL Posts: 1,352	It would be best to check with the membrane manufacturer to see what is required as far as membrane pressure is concerned. I believe most membranes are rated up to 80psi and it is important to run the membrane at the required pressure so you get a good Flux and the desired GPH the membrane is said to produce. __________________ "I'm to drunk to taste this chicken" - Ricky Bobby All T5 HO's Current Tank Info: 20 gallon

03/01/2015, 06:14 AM	#3
Raul-7 Registered Member Join Date: Aug 2004 Location: Lomita, CA Posts: 891	No, some membranes have a maximum of 300PSI. The DOW 75GPD can handle up to 150. Higher PSI means more GPD and better rejection rate. However, the housings are limited to 125. Last edited by Raul-7; 03/01/2015 at 06:20 AM.

03/01/2015, 08:45 AM	#4
mcgyvr Registered Member Join Date: Sep 2003 Location: North Carolina Posts: 20,050	80 psi is fine.. You could lower it a bit though if you are worried. Might help save you a bit on your water bill too.. Just find the pressure regulator at your house and adjust the bolt.

03/01/2015, 04:36 PM	#5
Raul-7 Registered Member Join Date: Aug 2004 Location: Lomita, CA Posts: 891	High pressure = more water saved.

03/02/2015, 04:37 AM	#6
azjohnny Registered Member Join Date: Apr 2012 Location: Gold Canyon Posts: 2,914	You can run the water pressure as high as you want as long as the canisters and fittings can handle it. I run mine in excess of 100psi

03/02/2015, 05:02 AM	#7
cryptic_grower Registered Member Join Date: Sep 2008 Location: burbs,Arizona Posts: 93	80 is good to go IMO