RODI Issues

[mginster]

Starting up my 120G after years. I am working on my RODI now and am getting terrible output rates. It is about 15 waste to 1 gallon filtered.

I have just changed all filters and the membrane. I tested removing the auto shut off, nothing helps. I used to get 5 to 1. What could be the issue?

Also as I disconnected all tubes, I am not 100% sure they are connected right, but 99% sure.

I have connected the pre-filters to RO membrane input. Then the waste side has my flow restrictor of 550 for a 75gpd. Do I have the RO membrane outputs correct in the image attached? The black tube is my pure, white is to the flow restrictor.

I know the problem is probably related to pressure, getting a gauge soon, but cant imagine its that much lower in a few years. Could there be buildup in all the lines?

 

[kharmaguru]

Picture looks correct. Is that a new flow restrictor or the one you used before? I ask because it's behaving like the restrictor is not sized properly. (550 should be fine but Amazon cheapy might not really be 550). It's a pain to take the membrane back out but maybe make sure the product fitting in the housing isn't blocked with gunk.

 

[mginster]

It was a new restrictor from BRS when I upsized the membrane to 75.

 

[kharmaguru]

It was a new restrictor from BRS when I upsized the membrane to 75.

Should be legit then.

 

[griss]

I’d bet on water pressure. Maybe nothing has changed in your house, but what about the surrounding area? More homes/businesses added lowering overall pressure in the area?

When we first moved to this house, water pressure was great. Low TDS out of the membrane and zero after DI. About a year ago, I started noticing those #’s going up. Replacing cartridges, membrane & DI had no effect. I ended up adding a pressure gauge to the system and, sure enough, low pressure across the membrane. Bought a booster pump and everything had been great since.