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Thread: Where to install pressure regulator?

  1. #1
    DIY Member Vitaliy's Avatar
    Join Date
    Sep 2005

    Thumbs down Where to install pressure regulator?

    Hi Guys,

    I have a question where to install pressure regulator before whole house
    water filter of after?

    About month ago I installed two stages whole house water filter.
    Unit came with two pressure gages one on filter inlet and second on outlet.
    I have noticed, city water pressure is 90+psi. This seems to be too high so,
    I decided to install pressure regulator. Initially I thought to install it right
    after meter/main and before whole house filter. However now I think, the
    best place for the pressure regulator will be after the filter. First of all, filter
    created me a pressure drop problem filter outlet pressure drops down to
    30-40psi (depend on water usage), but this is different story, I talked to
    filter supplier and he promised to send me different set of filters.
    My understanding is, with good filters differential pressure should be around
    10-15psi. Hopefully new set of filters will take care about this problem.
    So, putting pressure regulator after the filter should have a lot of benefits:
    filter will work better with higher input pressure;
    regulator will have filtered water and diaphragm should last much longer;
    house plumbing system will have more stable water pressure;

    Am I correct?

    Any ideas, comments and suggestions are very welcome.

    Thank you in advance,

    - Vitaliy

  2. #2
    Moderator & Master Plumber hj's Avatar
    Join Date
    Aug 2004
    Cave Creek, Arizona

    Default Prv

    The higher pressure on the filter unit could cause it to fail, depending on its construction. There will be a very great pressure differential on the filter media as it accumulates "junk", and the greater incoming pressure could force water thru the media and cause channels. I would put the regulator before the filter.


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