strange noise coming from RO/DI...

[jennmac415]

and it is making me CRAZY!!! All of a sudden a few days ago, my ro/di began making a very strange noise, sortof like a groaning noise... sounds like it is under pressure, like water pipes sometimes do. I have it tapped directly into my main water mainfest . It comes from the main manifest to the RO/DI, then I have a "T" and one line goes to a 32 gallon Brute can so I always have fresh water for making up water change water and the other line goes to my sump for top of... (I know I know... this is NOT recommended but we can debate that another day)...

so why does this all of a sudden sound like there is pressure in the lines and why is it making this sound??I have all valves open and main water supply on... It comes about every 5 seconds or so, a low groan, grind sound... making us all crazy...

any ideas why this is making this noise and how to get it to STOP???

[Flipper62]

Have you had it hooked up this same way this entire time ? and it just started making this noise ?

Most RO/DI units have the PVC...Push in fittings. It sounds like maybe one of them is sucking in air....Air got in the line & as the water is moving through the canisters.....its making that sound.

[PLNelson]

If the line coming out of the membrane is clear, or you have a piece of clear pipe you could put there, do you see many bubbles coming out of the unit? If so, I would check the connection for an air leak. Also, try and listen while it's doing it and see if you can isolate where the noise is coming from. Good luck.

[jmoney]

I would check your lines...we have nasty well water where I live and lime builds up inside my lines about every 2 months so I have to change them

[aquaman67]

Sounds like water hammer. Water suddenly starting and stopping makes that sound.

There are devices you can install to fix it. This may help.

http://home.howstuffworks.com/home-improvement/plumbing/how-to-fix-pipes5.htm