Upgrading an RO system
- Thread starter OurTown
- Start date
Rudy
Active member
This thread has got me thinking. I wonder if I've been running my unit at less than an "efficient" mode.
I had a 1 membrane Applied Membranes unit that was expanded to 2 membranes decades ago (when I added an additional automatic bay). The motor/pump was also up-sized.
I've been running the Product and Reject flows equally.
If I understand things....this is a 50% recovery rate....Correct?
Per my earlier post, I'm now running XLE (Extra Low Engery) membranes at 100psi.
Today, I readjusted the flow settings to achieve a 4.0 gpm Product and a 1.5 gpm Reject flowrate. The recirculation flow is 2.5 gpm.
Am I doing the math correctly and I now have a 73% recovery rate? (4.0 divided by 5.5)
And.....this rate is OK?
It sure saves dumping water down the drain if true............
I had a 1 membrane Applied Membranes unit that was expanded to 2 membranes decades ago (when I added an additional automatic bay). The motor/pump was also up-sized.
I've been running the Product and Reject flows equally.
If I understand things....this is a 50% recovery rate....Correct?
Per my earlier post, I'm now running XLE (Extra Low Engery) membranes at 100psi.
Today, I readjusted the flow settings to achieve a 4.0 gpm Product and a 1.5 gpm Reject flowrate. The recirculation flow is 2.5 gpm.
Am I doing the math correctly and I now have a 73% recovery rate? (4.0 divided by 5.5)
And.....this rate is OK?
It sure saves dumping water down the drain if true............
OurTown
Well-known member
I was told by several others year ago that I should run close to a 1:1 but favoring just a tad bit more on the reject water. With the reject all the way cranked down I can just barely get a little more product water than reject. Maybe it's designed that way?
When mine was installed they told me it is best to keep the product and reject equal. You can turn the reject down but that will shorten the life of the membranes.
OurTown
Well-known member
I turned it back on today and the best I can get now is 3.3 GPM product and 3.4 reject. The pressure regulator appears to be seized inside. I can crank the screw all the way in or out and doesn't seem to change the pressure. Right now it's about 180 psi. The tag on the pump says 250 psi max and 16 GPM. The regulator is a US Para Plate 13064 but can't find one on the innerwebs. The closest I found is one at KR but has a high pressure range.
https://www.kleen-ritecorp.com/p-17...d-back-pressure-regulator-1000-psi-8-gpm.aspx
https://www.kleen-ritecorp.com/p-17...d-back-pressure-regulator-1000-psi-8-gpm.aspx
Dan kamsickas
GinSan Technician
What is the GPM of the pump? Typically the pump is a 10GPM for two membranes with a 7gpm flow control on the output.
Rudy
Active member
I have a 8GPM Procon run by a 1.5 HP Baldor motor in my 2 Membrane setup.
Rudy
Active member
I still a little confused.
Is it best to run a 1:1 product:reject rate (50% recovery), or is it OK to turn up the recirculation and have a 75% (or higher) recovery rate?
Is it best to run a 1:1 product:reject rate (50% recovery), or is it OK to turn up the recirculation and have a 75% (or higher) recovery rate?
Ideal is 1:1 you can turn up the recirculation but it will shorten the life of your membranes
OurTown
Well-known member
250 psi max and 16 GPM on ours.
