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Thread: Bubbles When Vacuum Is Running

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    Bubbles When Vacuum Is Running

    Hi
    I just built a pool at my house and when the vac is running I see air bubbles coming from the suction line into the pump. When I switch the valve over to the skimmer it stops so the problem is with the suction pipe coming from the vacuum connection (it's a dedicated line 40' long with 2 sweep 90's and then connect to a Jandy valve prior to entering the pump ) After doing the basic troubleshooting;
    Checking hose for leaks
    checking pump and valve for leaks no improvement.
    Tried different pump speeds, lower speed helps a little but doesn't stop it
    I suspect a possible restriction in the pipe so I removed the Hayward thread in wall fitting from the pool to look inside pipe and bubbles stopped!! . Reinstall the fitting and the bubbles return immediately
    It appears that any restriction causes bubbles

    Any ideas

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    Re: Bubbles When Vacuum Is Running

    Welcome to TFP

    It is normal for the suction cleaner hose, they are friction connections and are not alway air tight, as long as the air bubbles are not filling up the pump or filter and restricting flow you are good
    Pool: Intex 16x32 15000 gal, 2 speed 340042, Pentair CC320 Filter, CircuPool SJ45 Salt System, Intermatic PE653RC; Hot Tub: 650 Gal SWG Megachlor
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    Re: Bubbles When Vacuum Is Running

    I removed the vac and hoses and held the flap open with my hand and it still creates bubbles. When I remove the wall fitting the bubbles stop

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    Re: Bubbles When Vacuum Is Running

    well that is interesting, it is all under water right? I have no idea how it would get air completely under water unless you have a suction side air leak and when you constrict water flow it is sucking air somewhere in the line... they are a pain to find but can be done..

    Pool School - Suction Side Air Leaks
    Pool: Intex 16x32 15000 gal, 2 speed 340042, Pentair CC320 Filter, CircuPool SJ45 Salt System, Intermatic PE653RC; Hot Tub: 650 Gal SWG Megachlor
    links: pool school * Recommended-Levels * SLAM * CYA chart * Test kits * How To Post Pictures * Poolmath * OCLT ** Support your website if we helped you :) **

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    Re: Bubbles When Vacuum Is Running

    Quote Originally Posted by cowboycasey View Post
    well that is interesting, it is all under water right? I have no idea how it would get air completely under water unless you have a suction side air leak and when you constrict water flow it is sucking air somewhere in the line... they are a pain to find but can be done..

    Pool School - Suction Side Air Leaks



    How likely is it for a pipe buried under 2' of compacted dirt to leak air into the pipe???

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    Re: Bubbles When Vacuum Is Running

    How likely is it for a pipe buried under 2' of compacted dirt to leak air into the pipe???
    Virtually impossible.

    I scanned your response perhaps too briefly but what makes you think the vacuum hose is not sucking in air? It is easily the most common problem.
    Dave S.
    42k vinyl and concrete pool, 1.5hp pump, 140gpm filter
    TFTestkits , PoolMath , Pool School

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    Re: Bubbles When Vacuum Is Running

    Quote Originally Posted by duraleigh View Post
    Virtually impossible.

    I scanned your response perhaps too briefly but what makes you think the vacuum hose is not sucking in air? It is easily the most common problem.
    I removed the vac hose and held the flap open and ran the pump. Still had bubbles. Then I removed the threaded on wall fitting so there was just an open pipe and the bubbles stopped. Put the fitting on and the bubbles returned

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    Re: Bubbles When Vacuum Is Running

    Wow! How is it possible for a fitting 18" underwater to suck in air. Something is being misconstrued as what you are describing simply can't be.

    What "flap" are you describing?
    Dave S.
    42k vinyl and concrete pool, 1.5hp pump, 140gpm filter
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    Re: Bubbles When Vacuum Is Running

    Does the filter pressure change when you remove that fitting vs on?
    Mark
    Hydraulics 101; Pump Ed 101; Pump/Pool Spreadsheets; Pump Run Time Study; DIY Acid Dosing; DIY Cover Roller
    18'x36' 20k plaster, MaxFlo SP2303VSP, Aqualogic PS8 SWCG, 420 sq-ft Cartridge, Solar, 6 jet spa, 1 HP jet pump, 400k BTU NG Heater

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    Re: Bubbles When Vacuum Is Running

    There is an air leak somewhere between the Hayward threaded fitting and the pump. The fitting is providing enough restriction of water to the pump that it is pulling air into it somewhere in between. To start I would first lube the pump basket lid o-ring and pump drain o-rings. If that doesn't stop it your problem may be worse. How much of the pipe is exposed?
    16' x 32' (21100 gal), vinyl, 1.5 hp Hayward SuperPump,
    Tagelus TA60/60D Sand Filter, Raypak 399K Digital Heater, TF-100

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    Re: Bubbles When Vacuum Is Running

    There is an air leak somewhere between the Hayward threaded fitting and the pump. The fitting is providing enough restriction of water to the pump that it is pulling air into it somewhere in between.
    Well, of course. Thanks for that, Pool Tool. and Mark L, I apologize that I couldn't envision what Pool Tool has posted....I think he has nailed it.
    Dave S.
    42k vinyl and concrete pool, 1.5hp pump, 140gpm filter
    TFTestkits , PoolMath , Pool School

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    Re: Bubbles When Vacuum Is Running

    Isn't it possible the pump is being starved for water with only a single suction providing the pump and cavitating? I can't use my vac port or even just one of my skimmers to vacuum without cracking another skimmer open. Just not enough water. This is with the pump on high. On low I can .
    Kris
    14x26 rectangle vinyl liner pool . 1.5 hp 2 speed tri star pump, 2 aqua genie skimmers , no main drain. 175 sq ft star clear cartridge filter. 200,000 btu hayward heater Tf-100

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    Re: Bubbles When Vacuum Is Running

    Bubbles in the returns are not caused by cavitation. When a pump cavitates, it creates vapor bubbles but these do not exist outside of the pump impeller. They collapse immediately as they travel from low pressure to high pressure inside the impeller. The ONLY way to get bubbles out of the returns is when air is getting sucked into the plumbing system.
    Mark
    Hydraulics 101; Pump Ed 101; Pump/Pool Spreadsheets; Pump Run Time Study; DIY Acid Dosing; DIY Cover Roller
    18'x36' 20k plaster, MaxFlo SP2303VSP, Aqualogic PS8 SWCG, 420 sq-ft Cartridge, Solar, 6 jet spa, 1 HP jet pump, 400k BTU NG Heater

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    Re: Bubbles When Vacuum Is Running

    Quote Originally Posted by mas985 View Post
    Bubbles in the returns are not caused by cavitation. When a pump cavitates, it creates vapor bubbles but these do not exist outside of the pump impeller. They collapse immediately as they travel from low pressure to high pressure inside the impeller. The ONLY way to get bubbles out of the returns is when air is getting sucked into the plumbing system.
    he only talked of bubbles in the pump... Not coming out of returns.and they would go away when an additional water source was introduced.
    Kris
    14x26 rectangle vinyl liner pool . 1.5 hp 2 speed tri star pump, 2 aqua genie skimmers , no main drain. 175 sq ft star clear cartridge filter. 200,000 btu hayward heater Tf-100

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    Re: Bubbles When Vacuum Is Running

    Ok but that is still not cavitation. And if air is getting in the pump basket, it will eventually make it out the returns. It has no where else to go.
    Mark
    Hydraulics 101; Pump Ed 101; Pump/Pool Spreadsheets; Pump Run Time Study; DIY Acid Dosing; DIY Cover Roller
    18'x36' 20k plaster, MaxFlo SP2303VSP, Aqualogic PS8 SWCG, 420 sq-ft Cartridge, Solar, 6 jet spa, 1 HP jet pump, 400k BTU NG Heater

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    Re: Bubbles When Vacuum Is Running

    Kmaz,

    Don't hijack the op's thread. Your question on cavitation can be found here Trouble Free Pool
    Dave S.
    42k vinyl and concrete pool, 1.5hp pump, 140gpm filter
    TFTestkits , PoolMath , Pool School

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    Re: Bubbles When Vacuum Is Running

    Sorry.. Not a hijack directly related to his prob
    14x26 rectangle vinyl liner pool . 1.5 hp 2 speed tri star pump, 2 aqua genie skimmers , no main drain. 175 sq ft star clear cartridge filter. 200,000 btu hayward heater Tf-100

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