RO Membrane? for SPS dominate tank
- Thread starter jfingers8
- Start date
dvanacker
DID I SOUNDS SMRT??
I think the best way to restrict the flow is by using a JG ball valve and a PSI gauge right before the membrane. Then you can adjust and set the pressure on the membrane as you watch the guage. This assures you are supplying the right amount of pressure on the membrane.
I know I must becoming across like a real hardcase - my apologies, it is not my intent...but NO - the flow restrictor that we are talking about is "downstream" of the membrane, or after it.
The problem with restriction on the up-stream side/ in front of the membrame is that you actually need to increase the pressure on the membrane in order to make it function properly.
That is why you see many guys using "booster pumps" - to increase - not restrict - the pressure to the membrane.
Flow restrictor helps to maintain the elevated pressure in the membrane housing, instead of allowing it to escape downstream
T
The problem with restriction on the up-stream side/ in front of the membrame is that you actually need to increase the pressure on the membrane in order to make it function properly.
That is why you see many guys using "booster pumps" - to increase - not restrict - the pressure to the membrane.
Flow restrictor helps to maintain the elevated pressure in the membrane housing, instead of allowing it to escape downstream
T
Chipie
Active member
LifeAquatic
New member
What is a flow restrictor? You should be able to house any GPD type ro membrane in your sytem.If you have decent water pressure from the faucet you can upgrade from 50 GPD to 75 or 90 GPD no problem. They are all universal and drop right in to the membrane housing. Just make sure to buy a good name brand. There are lots of chinese knock offs out there.
Chipie
Active member
LifeAquatic
New member
One more detail. I think the membrane has a built in flow restrictor. This is the hole that lets excess water escape that isnt pushed through the membrane. Take a look at the membrane and you will see what Im describing. The smaller the hole the more GPD the membrane will handle.
Chipie
Active member
There's no flow restrictor on the membrane. Yes all membranes fit into the housings. They are universel. But you need a flow restrictor to control flow and pressure on the membrane. Here's a link to BRS http://www.bulkreefsupply.com/store/Changing-the-flow-restrictor-on-your-membrane
LifeAquatic
New member
Wow! I had no idea there was a flow restrictor. Ill have to see where mine is located. Thanks for the good info.
dvanacker
DID I SOUNDS SMRT??
Is that post towards me??
If so I put the ball valve on the waste end of the RO MEMBRANE and restrict the flow with it just like a fixed flow restrictor would only with a ball valve and PSI guage (watching the pressure) I can adjust it perfectly. I never said I restrict the input of the membrane....that would cause your RO to not work at all.
dvanacker
DID I SOUNDS SMRT??
I re-read my post and it does seem that way. But I only put the PSI guage on the input end (after prefilters and right before the membrane) and the ball valve goes on the waste out of the membrane. When you adjust the ball valve you can watch the pressure on the membrane go up and down.
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