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Thread: Filter makes gurgling noise when pressure is lowered

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    Filter makes gurgling noise when pressure is lowered

    So my filter makes noise like there is air in the valve only when I am not sending the return water through the pool heater.

    From my filter i can either send the water through the heater or straight out to the pool.
    Whenever I close off the heater and send the water straight out to the pool I get a drop of a couple pounds of pressure on the filter and the air noise starts up. So I always just ran the water though the heater first then out to the pool.

    Now my heater has started to leak and I can no longer send water underpressure to it without a wet pool house.

    I never used the heater and don't plan on buying a new one, but I can't stand that air gurgling sound in the filter it makes as much noise as the pump does in first place.

    Any Ideas on how to stop this?

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    Mod Squad JohnT's Avatar
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    Re: Filter makes gurgling noise when pressure is lowered

    Is your pump strainer basket completely full with no bubbles?
    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: Filter makes gurgling noise when pressure is lowered

    Yes completely full and sealed. Doesn't make sense I know.

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    Re: Filter makes gurgling noise when pressure is lowered

    Air can only enter the system from the suction side.....from the skimmers to the pump.....nowhere else.

    A pressure drop when you close the heater indicates increased flow which makes sense.

    Since there is NO air entering (Look again at the pump basket lid when the pump is running) then it would seem your noise is coming from some source other than air. What that might be I have no idea.

    If you shut off the pump, does the pump basket stay full of water for 12 hours or so or does it slowly fill with air?
    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: Filter makes gurgling noise when pressure is lowered

    Welcome to TFP.

    What filter do you have. It always helps to know what equipment we're dealing with. It would be good if you could put your equipment info in your sig so it'd be available all the time.

    There are reports of filters making a noise under high flow rates, but without knowing which filter you have I don't know if it's one of them.
    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
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    Re: Filter makes gurgling noise when pressure is lowered

    The system stays primed so that would make me think it is something other then air making the noise but air gurgling is what it sounds like.

    Maybe something in the filter starts rattling around like larger pieces of sand or pebbles? I've tried to clean that stuff off the top buts its a mighty hard process.

    Its a hayward sand filter don't know the exact model right now. Hayward pump 1.5hp. Sta-rite heater. pool is 17x37 grecian.

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    Mod Squad Bama Rambler's Avatar
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    Re: Filter makes gurgling noise when pressure is lowered

    Find out the model number if you can, but some Hayward sand filters had a rattling problem.
    You can search for it and should be able to find a few posts about it and how it was fixed.
    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
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    Re: Filter makes gurgling noise when pressure is lowered

    Thanks that sounds like what I've got I'll look into it.

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    Re: Filter makes gurgling noise when pressure is lowered

    The filter is a hayward s220t I haven't been able to find anything on here or the web that sounds like the same problem I have.
    17'x37' grecian Hayward 1.5hp pump, Hayward s220t Filter

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    Mod Squad Bama Rambler's Avatar
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    Re: Filter makes gurgling noise when pressure is lowered

    If I remember correctly, it was the stand pipe and I think the fix was to slip an o-ring over it and let it sit against the multiport valve port.
    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
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    Re: Filter makes gurgling noise when pressure is lowered

    Thanks! I will give that a try when I open it up this spring.
    17'x37' grecian Hayward 1.5hp pump, Hayward s220t Filter

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    Mod Squad jblizzle's Avatar
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    Re: Filter makes gurgling noise when pressure is lowered

    When bypassing the heater and seeing the lower filter pressure, that means you are likely increasing the flow rate. Since it does not sound like you are actually seeing any air anywhere, I think Dave is likely right that something is "rattling" in the filter at the higher flow rate.
    Jason, TFP Moderator
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