New RODI but low water preasure

[jcjule]

I bought a Spectrapure RODI system but the water preassure is 22 psi. The recommended preassure for the system is 40-80 psi

What are the effects of running the system at this preassure?

I will buy a pump to increase it but i´m still wondering the effects of low preassure

Thanks

[musky1963]

I had the same problem. I ordered a booster pump from Buckeye Field Supply several months back. Using low pressure drastically reduces the filter life and also the resin. My pressure went from 30-50lbs.(well water) to 80. So much faster at making water and less resin changes.

[AZDesertRat]

At 22 psi it will not even work at all, thats not sufficient pressure to pass water through the membranes fabric. A booster pump is your best option.

[tkeracer619]

<a href=showthread.php?s=&postid=12473671#post12473671 target=_blank>Originally posted</a> by AZDesertRat
At 22 psi it will not even work at all, thats not sufficient pressure to pass water through the membranes fabric. A booster pump is your best option.

I am using a spectrapure 150gpd RO on a large service account. The building hit that awesome 20psi number and the RO could not keep up with top off. Added a booster pump to 80psi and in 4 days we have 600 gallons in the storage tank.

I have 40 psi at my house but I still think I am going to get a booster after seeing the difference high pressure makes on a RO system.

[AZDesertRat]

Higher pressure also increases the rejection rate or filter efficiency. At 90 psi I am over 99% rejection.

[jcjule]

Thanks for all the responses

AZDesertRat, what do you mean whith rejection rate?
I though it is supposed to reject 4-6 gal for each purified gallon?

[AZDesertRat]

No, thats waste ratio or flush water. The rejection rate is the %efficiency of the membrane. A 98% rejection rate means for every 100 TDS going in you get 2 TDS out and the other 98% gets wasted.
To calculate your rejection rate take the incoming TDS, subtract the RO only TDS then divide that number by the original incoming TDS.
If I use my numbers, Tap Water TDS =835 and RO only TDS = 5.3
835-5.3 = 829.7 Divided by 835 = 99.365% rejection rate or removal efficiency.