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Thread: Sudden Drop in pressure. Help!

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    Sudden Drop in pressure. Help!

    Hi guys, Something really weird is going on.... I'm getting normal pressure, then sudden drop, then back up to normal, then back down and it stays there.

    Things I've done:
    Cleaned the skimmer line (only have one)
    Blew out (with air) the skimmer line from the pump. no problems that I can tell.
    Took off the motor at pump and checked for clogs, etc. Nothing...
    Motor is about 5 years old and when taking it off the unit and operating in open air, works fine.

    Any ideas?
    Thanks
    My lovely money pit = 1971 20x40 ft Concrete pool. 2008 Hayward SuperPump 1.25 HP. 2010 Hayward 244T Sand Filter. 2011 Skimmer (1) Returns (3) with 2011 plumbing in series. 2009 Rheem P-M336 Digital Gas Heater.

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    Mod Squad JohnT's Avatar
    Join Date
    Apr 2007
    Location
    SW Indiana
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    9,089

    Re: Sudden Drop in pressure. Help!

    Watch the water in your skimmer. Any surging or vortex?
    TFP Moderator
    20K Gallon 20X36 Vinyl Inground
    Hayward S244T Sand Filter with 1HP Whisperflo Pump. Liquidator C-201 and Solar Heat

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    Re: Sudden Drop in pressure. Help!

    Nope just a slow crappy suction.
    My lovely money pit = 1971 20x40 ft Concrete pool. 2008 Hayward SuperPump 1.25 HP. 2010 Hayward 244T Sand Filter. 2011 Skimmer (1) Returns (3) with 2011 plumbing in series. 2009 Rheem P-M336 Digital Gas Heater.

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    Join Date
    Nov 2010
    Location
    Calera, Al
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    271

    Re: Sudden Drop in pressure. Help!

    It would be helpful to know what type of equipment you have. If you go into the user control panel and edit your signature to include your info, pool type, volume, equipment ect....
    17,000 gal, IG Gunite Diamond Brite plaster Kidneybean,w/7x11 tanning ledge& 3x5 swimout bench,244T 300lb Hayward Pro high rate sand filter(63 GPM) , Hayward 1Hp Super Pump w/3/4 hp booster pump, Polaris 280, Laars Lite 2 175k N/G Heater, Tf-100, Speed stir

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    Re: Sudden Drop in pressure. Help!

    Edited my signature! How's That?
    My lovely money pit = 1971 20x40 ft Concrete pool. 2008 Hayward SuperPump 1.25 HP. 2010 Hayward 244T Sand Filter. 2011 Skimmer (1) Returns (3) with 2011 plumbing in series. 2009 Rheem P-M336 Digital Gas Heater.

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    Join Date
    Nov 2010
    Location
    Calera, Al
    Posts
    271

    Re: Sudden Drop in pressure. Help!

    Excellent! Most helpful, Have you backwashed? Is your filter pressure high as compared to normal?
    17,000 gal, IG Gunite Diamond Brite plaster Kidneybean,w/7x11 tanning ledge& 3x5 swimout bench,244T 300lb Hayward Pro high rate sand filter(63 GPM) , Hayward 1Hp Super Pump w/3/4 hp booster pump, Polaris 280, Laars Lite 2 175k N/G Heater, Tf-100, Speed stir

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    Re: Sudden Drop in pressure. Help!

    ya I tried to backwash it however the pressure is too low to do anything...

    I checked the skimmer line with a DRAIN KING. Water comes through no problem.

    Also, it gets to normal operating PSI then drops.... builds up again... then drops...

    really weird.
    My lovely money pit = 1971 20x40 ft Concrete pool. 2008 Hayward SuperPump 1.25 HP. 2010 Hayward 244T Sand Filter. 2011 Skimmer (1) Returns (3) with 2011 plumbing in series. 2009 Rheem P-M336 Digital Gas Heater.

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    Mod Squad Bama Rambler's Avatar
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    Jun 2009
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    SouthWest Alabama
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    22,339

    Re: Sudden Drop in pressure. Help!

    Is there air in the pump strainer basket when it's running? If so remove and clean the strainer basket o-ring and lube it good before putting it back. Check it for nicks or cuts while you have it out.
    Dave J. TFP Moderator
    24' x 52" Round AGP. 2hp/¼hp SPL Power-Flo 2-speed pump. 200sqft Waterway Cartridge Filter. 45MHP2(3GPD) Stenner Peristaltic Pump
    Pool School ----- Pool Math ----- TF-Test Kit

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    Re: Sudden Drop in pressure. Help!

    Think I know what it is... stay tuned...
    My lovely money pit = 1971 20x40 ft Concrete pool. 2008 Hayward SuperPump 1.25 HP. 2010 Hayward 244T Sand Filter. 2011 Skimmer (1) Returns (3) with 2011 plumbing in series. 2009 Rheem P-M336 Digital Gas Heater.

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    Join Date
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    4,160

    Re: Sudden Drop in pressure. Help!

    This won't fix any problem but it will eliminate the filter - how does the pool run when you put the multiport on 'recirc'?
    Luv& Luk
    -Ted

    Having done construction and service for 4 pool companies in 4 states starting in 1988, what I know about pools could fill a couple of books - what I don't know could fill a couple of libraries :-D

    POOL SCHOOL, TF Testkits, Jason's Pool Calculator, CYA vs. cl chart, (Just a few DARNED handy links!)

  11. Back To Top    #11

    Re: Sudden Drop in pressure. Help!

    I'm having this problem right now after having just replaced the pump motor. Investigating now, but if you did find an answer, I'd love to know.

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