Reverse Osmosis and water filtration systems that make too much noise or vibrates

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A Reverse Osmosis or drinking water filtration system can start making a lot of noise after changing filters or performing maintenance.  What's wrong?  What are "Pressure Differential Vibrations"?

    Reverse Osmosis and water filtration systems sometimes start making a pulsing noise or vibrating sound after changing the filters or performing other service work.  It is called Pressure Differential Vibrations or Pulsing.   This is caused by a change in the water pressure within the system.  New filters or a reverse osmosis membrane not yet fully saturated with water are the common cause.  It will typically diminish until it finally stops completely.

    Another common cause is a bad flush valve in a toilet in the house.  While the RO system is making the pulsing sound start flushing the toilets one by one until you flush one that stops the pulsing.  That is the toilet that needs a new flush valve.

    If the problem persists, check the incoming water line valve to be sure it is all of the way open.  If it is not open all of the way, the low "Volume" of flow can starve the system and cause the Vibrating sound.  If you have a "Self Piercing Feed Water Tap Valve" style of Tap Valve, close the inlet water valve all of the way, forcing the Needle to fully pierce the copper tube, and then re-open it all of the way.   If this does not increase the "volume" of flow sufficiently to correct the vibrations caused by an insufficient flow rate from the feed line, you may need to increase the size of the supply feed at the tap point. This can be done with a valve like the John Guest Angle Stop Valve or the Easy Tap Valve.  They allow a larger water pathway than the tap valves.

    Other times the Auto Shut Off Valve needs replaced.  The Pressure Differential flaps the diaphragm in the valve causing it to alternate between open and closed.  Other times the pulsing can be stopped by shortening the poly tubing connecting the system to the the feed water supply.   Do not shorten any of the tubes that are a part of the RO system (inter-connecting the filter housings, membrane housing and valves).  Shorten only the excess in the supply, drain or tank tubes.  Be sure that no tubes have been "kinked" and now reduce the water flow.


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