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Thread: Pool Pump PSI going up and down by 10 PSI every 20 Seconds

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    Join Date
    Apr 2015
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    Phoenix,AZ
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    1

    Pool Pump PSI going up and down by 10 PSI every 20 Seconds

    I just finished cleaning my Starite System 3 Cartridge Filters for the first time on my own. I put everything back together and used magic lube on the O-ring and primed and started to run the pump. The air pockets usually work themselves out within 5 minutes and the system runs normally. The PSI on my pressure gauge goes up to 25PSI when the pool pump sounds normal and then after 20 seconds the pool pumps starts making a funny noise like there is air in the system and the PSI drops to 15PSI and then 20 seconds later it goes back to normal. I tried to bleed the system by opening the pressure valve on top of the filter. I stopped the pump and re primed the system. Maybe I didn't put the cartridges back on properly or the O-ring may not be sealed and air is constantly getting in to the system. Should I open the filter and re lube the O-ring and put it back together again. Any advice or solutions would be appreciated.
    Inground 18,500 gallon pebble tec pool, Ultraflow 2HP Pool Pump and Ultraflow 2HP Booster Pump,
    Starite System 3 Cartridge Filter (450 sq.ft.) Attached Spa, A&A Manufacturing Infloor pop up cleaning system.
    TF-100 Test Kit Pool Built in 1999. Phoenix,AZ.

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    Mod Squad JohnT's Avatar
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    Apr 2007
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    SW Indiana
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    Re: Pool Pump PSI going up and down by 10 PSI every 20 Seconds

    Welcome to TFP!

    Check your skimmer and pump basket while this is happening. Look for the skimmer nearly emptying or gulping air, or bubbles in the pump basket. Your problem sounds like a suction side issue rather than a problem with the filter.
    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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    duraleigh's Avatar
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    Re: Pool Pump PSI going up and down by 10 PSI every 20 Seconds

    +1 what JohnT said. You may have to add water to the pool if it is gulping air in the skimmer.
    Dave S.
    42k vinyl and concrete pool, 1.5hp pump, 140gpm filter
    TFTestkits , PoolMath , Pool School

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    pabeader's Avatar
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    May 2015
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    Re: Pool Pump PSI going up and down by 10 PSI every 20 Seconds

    And another +1. But a question also, is 25psi normal for your pump and filter?
    Bob - Palm Beach by San Juan Pools. approx 5000 gals., Pentair 320 cartridge filter (all new guts installed by me), Goldline SWG, 'New to me' Kreepy Krauly Sand Shark, Intermec 104 Timer Test kit: TF-100 w/Speed Stir

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