Reduce "Water Hammer" in a Permeate Pump Brine-Out Line

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Jimbus

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Hi Plumbing Experts,
I'm brand new to this forum and I know nothing about plumbing. I installed a 7 stage RO system under my sink early last year and never really got the system to meet my expectations. The last part of the system I'm trying to fix is the operating volume. Please if you know how to reduce the noise of an under-sink RO system, help me out...

Description of Problem: very loud sound & vibration (like a "water hammer?") when the Brine-Out Line begins draining from the Permeate Pump. This is not a new occurrence, it has happened for the entire lifetime of the system. I'm hoping to find a way to reduce the volume of the sound.

It's a very simple system, as you can see in the attached diagram, the Permeate Pump is an ERP 500 and I've got a 35 GPD membrane. The filters and everything are in good condition, they're relatively new. The hoses/lines are all ez-fit and there are no leaks. I have bled the system multiple times to ensure there is no air trapped inside. I recently input a flow regulator on the inlet line to the system, reducing the pressure to 60 PSI. This was a good decision, because it helped remove tiny bubbles from faucet water. It helped reduce the "water hammer" before the tank gets fully pressurized; but when the tank is near full, jeez the permeate pump is noisy.

So far, I've considered adding a pressure regulator on the brine-out line and/or foam pipe insulation. What are your thoughts?
 

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Reach4

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Water hammer" is not the term that applies here. That does not mean that your permeate pump is not loud.

I would look into acoustic panels.

 

Jimbus

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Water hammer" is not the term that applies here. That does not mean that your permeate pump is not loud.

I would look into acoustic panels.

Hi there,
Thanks for pointing out my ignorance, easy spot!

Anyway, sound absorbent panels were the first thing I tried for noise. I have inlaid the entire area under the sink with the highest grade sound absorbent panels and then made a few sound boards out of sticking them together back to back and rested those in between the clanking hoses.

Maybe you have another idea?

Thank you for trying!
 

Jimbus

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Ever talk to factory tech? Brand and model of system?
Hi there,
Yes of course, I called a US Water Systems tech first thing. They didn't seem convinced that it was much louder than a typical permeate pump and generally dismissed the problem. I asked them if there were any similar complaints and they said that permeate pumps typically make sound and its a good way of knowing that they are working. So, the reps were not helpful in finding a solution.
 
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