Flow restrictor on RO/DI?

[cnaegler]

Hello everyone,
Just a quick question for anyone. Which line would the flow restrictor be located in? I'm assuming the input line but, you know what you get by assuming. I've also read that the TFC membrane sometimes has one built in.... How would someone tell if it is built in?
The reason i'm asking is that i bought a used 100GPD RO/DI unit off of a reefer here on RC. I replaced all the filters and membrane about 9 months ago. It worked great until recently when it just stopped working suddenly. My TDS meter reads 000 but i have air in my DI chamber. I only have a TDS reading of 23 on the input side so i didn't think the membrane has expired. I've bled the air out numerous times but to no avail. I just want to be sure that the lack of the proper flow restrictor is not the culprit but i'm not sure where exactly to check. Thanks for everyone's time.

 

[Jefe12234]

Are you saying that it's still producing 0 TDS water? If so, how is it not working? It's normal for DI chambers to have air in them sometimes. My final DI chamber always drains to the bottom when it's running. Water can still pass through the canister since the chamber is pressurized. Also, the flow restrictor should on the waste line. It's a cylinder maybe 3/4" in diameter. I don't know about built-in flow restrictors.

 

[cashyboy]

Sometimes there is flow restrictors inside the fitting to the wasteline output on the tfc membrane housing, hopefully that makes sense. I had to take mine out at one time and replace it with an inline to boost the output of my unit.

 

[cnaegler]

<a href=showthread.php?s=&postid=14471930#post14471930 target=_blank>Originally posted</a> by Jefe12234
Are you saying that it's still producing 0 TDS water? If so, how is it not working? It's normal for DI chambers to have air in them sometimes. My final DI chamber always drains to the bottom when it's running. Water can still pass through the canister since the chamber is pressurized. Also, the flow restrictor should on the waste line. It's a cylinder maybe 3/4" in diameter. I don't know about built-in flow restrictors.

Yes, it's still producing 0 TDS water but maybe only a gallon a day. I'm just going to replace all filters and the membrane and hopefully that works.