RO Membrane in and out ports.

[Clownreef]

Hello all,

Dumb question but.. which one is in and out on the membrane? I have a 7 state BRS unit. I have the blue line which I think is on the port into the sediment filters. Is this correct?

Thank you!!

 

[KStatefan]

The membrane housing will have one in and two outs

 

[Clownreef]

Correct. I just need to know which one goes to waste and which does to DI..

 

[TCK Corals Verified Sponsor]

Hello all,

Dumb question but.. which one is in and out on the membrane? I have a 7 state BRS unit. I have the blue line which I think is on the port into the sediment filters. Is this correct?

Thank you!!

Blue is the R.O water and should go to the DI. Red is the waste water, and should have a flow restrictor of some kind either capillary by the fitting or inline

 

[Clownreef]

Blue is the R.O water and should go to the DI. Red is the waste water, and should have a flow restrictor of some kind either capillary by the fitting or inline

They’re not color coated. I only had those colors. I’m trying to figure out if I have them plumbed correctly.

 

[TCK Corals Verified Sponsor]

They’re not color coated. I only had those colors. I’m trying to figure out if I have them plumbed correctly.

I was basing the color coding on the photo provided. The setup looks correct.

 

[Clownreef]

I was basing the color coding on the photo provided. The setup looks correct.

I have the waste out on the red line. Looks like the water to waste is the top one?

 

[EeyoreIsMySpiritAnimal]

I have the waste out on the red line. Looks like the water to waste is the top one?

Does your membrane housing have a plus and minus on the end?

The minus is the waste line.

If there are no markings, the good water line (that goes to the di) is farthest back on the housing.

 

[Clownreef]

Does your membrane housing have a plus and minus on the end?

The minus is the waste line.

If there are no markings, the good water line (that goes to the di) is farthest back on the housing.

No markings.

Then by that notion I should be good!

 

[Buckeye Hydro Verified Sponsor]

I like to try to explain things so people understand, rather than try to memorize info about their RO system. So how do you know which port is the permeate (RO water) and which port is the concentrate?

This should help. All you have to remember is that permeate comes out of the central stem of the membrane.

 

[EeyoreIsMySpiritAnimal]

All you have to remember is that permeate comes out of the central stem of the membrane.

Thanks for the visual! A picture really is worth 1000 words :)

 

[jaibie24]

I like to try to explain things so people understand, rather than try to memorize info about their RO system. So how do you know which port is the permeate (RO water) and which port is the concentrate?

This should help. All you have to remember is that permeate comes out of the central stem of the membrane.

Thank you!

 

[Buckeye Hydro Verified Sponsor]

• The graphic from the pet supplies vendor above has some issues:
  *Sediment filters and carbon blocks are radial flow, rather than axial flow cartridges. Water does not enter at one end and exit the other (axial flow). For these filters, water passes through the side wall into a hollow in the center. The flow direction through the DI carts is correct - they are axial flow. Ever wonder why some carts trap air in the upper part of the housing? Ever notice that this only happens with axial flow carts?
• *RO membranes really should remove more than 95% of the TDS
• *The blue-faced inline TDS meter is a DM1 - with only two probes. The meter with three probes is the TRM1, and it has a green face: https://www.buckeyehydro.com/trm1-tri-inline-tds-meter/