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Thread: Air bubbles in pump basket/losing prime

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    Air bubbles in pump basket/losing prime

    I have a 33,000 Gal in-ground gunnite pool, a Triton II sand filter, Sta-Rite Dyna-Glas 1 1/2 HP pump. When operating the pump with both the skimmers and main drain open, there are air bubbles in the pump basket and I lose prime when I shut the pump off. I noticed yesterday that if I close the skimmer line, the pump basket has no bubbles, and I am able to start the pump without the need to prime.

    In reviewing other posts and comments, I understand that air is getting in the line. There are a couple of points where water drips from the plumbing and pump basket. Would these be the source of the air leaks? If so, I don't understand why I don't have the loss of prime issue when only the main line is open.

    Any thoughts and advice will be appreciated. Thanks.
    33,000 gallon, inground, gunnite pool; sand filter

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    Mod Squad Bama Rambler's Avatar
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    Re: Air bubbles in pump basket/losing prime

    It sounds like your skimmer is sucking in air.
    Is the weir working freely and properly?
    Is the skimmer creating a vortex and sucking in air?
    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: Air bubbles in pump basket/losing prime

    One of the skimmers did start swirling and sucking water yesterday when I was trying to restart after losing prime. This is what prompted me to turn off the skimmers, and learned that with the main line only open, I didn't have air in the lines.

    Weir? Are you talking about the skimmer flaps/doors?
    33,000 gallon, inground, gunnite pool; sand filter

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    Re: Air bubbles in pump basket/losing prime

    Weir? Are you talking about the skimmer flaps/doors?
    Yes.

    What bama is also saying is your pool water is too low and air is being sucked into the system through the skimmers. Filling your pool up about an inch higher will cure it.
    Dave S.
    42k vinyl and concrete pool, 1.5hp pump, 140gpm filter
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    Mod Squad Bama Rambler's Avatar
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    Re: Air bubbles in pump basket/losing prime

    Yes the weirs (flappers) need to be in place and working freely. And as Dave said, even if they're working correctly the water needs to be more than half way up the skimmer on some pools.
    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: Air bubbles in pump basket/losing prime

    This happened to me and the problem was that the skimmer door (weir?) was getting stuck and not allowing water to freely enter the skimmer. There was some dried cement (gunite or grout) on the edges of the door that caused the door to stick. It only took the door staying closed for a second for air to get into the system and for the pump to lose its prime. I scraped off the small amount of cement on the edges of the door and haven't had a problem since.
    9,200 gal. Gunite Luna Quartz French Grey pool with spill over spa, two fountains on tanning ledge (rarely used)
    Pentair Whisperflo 2HP, Pentair CCP Cartridge 420 Sq. Ft., Polaris 280 with booster pump
    Pentair EasyTouch 4, RayPak LoNox 266k Natural Gas heater, Aqua Rite SWCG T Cell 9, Borates, TF-100 test kit

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    Re: Air bubbles in pump basket/losing prime

    The garden hose is running in the pool as I write this. Hopefully, that will solve the air in the lines that I was experiencing even before the "vortex experience". I love an easy fix!! I'm headed out to carefully inspect the skimmer doors. Thanks for your time.
    33,000 gallon, inground, gunnite pool; sand filter

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