RO/DI unit siphon?

Meshmez · 01/10/2012, 12:22 PM

I have a BRS 5stage RO/DI unit. It has a booster pump on the inlet and then the supplied manual shutoff valve before the water enters the unit. The outputs are just open to the air. Sometimes when I shut off the unit it partially drains one or some of the canisters. It seems to do it differently each time (not always the same amount or from the same canister) and sometimes it doesnt do it at all and leaves them all full. When it drains them it takes a while for it to get all the air out of the system again the next time I run it. unfortunately I havent been able to track the differences to different shutdown procedure or anything, and I havent found any leaks. Has anyone experienced this or know how to fix it? I want the canisters to just stay full.

sirreal63 · 01/10/2012, 02:12 PM

The easy solution is to route the exits higher than the unit. Have you discussed this with BRS? They actually have excellent customer service.

Meshmez · 01/10/2012, 05:07 PM

I have talked to BRS about this.. The response I got was "ya that happens sometimes" though for the most part I agree with you about their customer service. Its also weird that I didnt have the issue until recently (I have had the unit for a few months now) which led me to believe there was a leak of some sort. Ill try raising the hoses, but it seems that most people mount the units on their wall and their exits would tend to be below the unit..

sirreal63 · 01/10/2012, 05:10 PM

In order to drain like that, air has to enter the front end of the unit, if there was an air opening anywhere else, it would leak when the unit is on. I have had this issue but I do know that raising the outlet should stop it. Kind of weird, I wonder too if the booster pump is allowing air in, but that should also leak when on.

sirreal63 · 01/10/2012, 05:18 PM

Double

Meshmez · 01/10/2012, 05:31 PM

Quote:

Originally Posted by sirreal63

In order to drain like that, air has to enter the front end of the unit, if there was an air opening anywhere else, it would leak when the unit is on. I have had this issue but I do know that raising the outlet should stop it. Kind of weird, I wonder too if the booster pump is allowing air in, but that should also leak when on.

Ya, an air leak was my first thought. The unit made a weird sound at the RO membrane leading me to believe air was coming in, which is when I checked for leaks and checked all connections, all looked ok so I called BRS. I couldnt see bubbles entering any of the pre-filter canisters, which leads me to believe its something after them, but again, no leaking messes up that theory.

01/10/2012, 12:22 PM	#1
Meshmez Registered Member Join Date: Dec 2010 Location: San Jose, CA Posts: 1,030	RO/DI unit siphon? I have a BRS 5stage RO/DI unit. It has a booster pump on the inlet and then the supplied manual shutoff valve before the water enters the unit. The outputs are just open to the air. Sometimes when I shut off the unit it partially drains one or some of the canisters. It seems to do it differently each time (not always the same amount or from the same canister) and sometimes it doesnt do it at all and leaves them all full. When it drains them it takes a while for it to get all the air out of the system again the next time I run it. unfortunately I havent been able to track the differences to different shutdown procedure or anything, and I havent found any leaks. Has anyone experienced this or know how to fix it? I want the canisters to just stay full.

01/10/2012, 02:12 PM	#2
sirreal63 Go Spurs Go!!! Join Date: Dec 2004 Location: Meadowlakes Texas Posts: 13,357	The easy solution is to route the exits higher than the unit. Have you discussed this with BRS? They actually have excellent customer service. __________________ Jack No One has ever been seriously injured by using the search function. Alcohol, Tobacco and Firearms should be a convenience store, not a government agency. Current Tank Info: Reefing the Pentagon.

01/10/2012, 05:10 PM	#4
sirreal63 Go Spurs Go!!! Join Date: Dec 2004 Location: Meadowlakes Texas Posts: 13,357	In order to drain like that, air has to enter the front end of the unit, if there was an air opening anywhere else, it would leak when the unit is on. I have had this issue but I do know that raising the outlet should stop it. Kind of weird, I wonder too if the booster pump is allowing air in, but that should also leak when on. __________________ Jack No One has ever been seriously injured by using the search function. Alcohol, Tobacco and Firearms should be a convenience store, not a government agency. Current Tank Info: Reefing the Pentagon.

01/10/2012, 05:18 PM	#5
sirreal63 Go Spurs Go!!! Join Date: Dec 2004 Location: Meadowlakes Texas Posts: 13,357	Double __________________ Jack No One has ever been seriously injured by using the search function. Alcohol, Tobacco and Firearms should be a convenience store, not a government agency. Current Tank Info: Reefing the Pentagon.

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01/10/2012, 05:07 PM	#3
Meshmez Registered Member Join Date: Dec 2010 Location: San Jose, CA Posts: 1,030	I have talked to BRS about this.. The response I got was "ya that happens sometimes" though for the most part I agree with you about their customer service. Its also weird that I didnt have the issue until recently (I have had the unit for a few months now) which led me to believe there was a leak of some sort. Ill try raising the hoses, but it seems that most people mount the units on their wall and their exits would tend to be below the unit..