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Thread: air bubbles

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    air bubbles

    First summer with a pool, can't wait. Couple of quick questions.....

    1) I have a Stealth Pump 2 hp 2 speed and I tried the low speed out for the first time yesterday. I noticed that when it was in low speed air bubbles would shoot out into the pool out of one jet. When I switched it back to high speed, after a big burst of bubbles it didn't do it in high speed but still did it in low. Why would this be, is it something to worry about?

    2) Will low speed circulate and filter water enough for summer? I'm assuming I only need High speed for spa or fountain.....correct? And I guess it would save $$ on our bill?

    3) We have a polaris sweep, do I still need to vacuum the pool if sweep is on and I brush once a week?

    Thanks!
    15x32 16k Gal IG riversand (pebblesheen) pool, Filter: Jandy 48 sq ft DE filter, Circulation Pump: Stealth Pump 2 hp 2 speed, SWCG, Heater Size and Electronic Ignition: Jandy LRZ400 Natural Heater, Cleaning System: Polaris 280, Spa: 8 Jets, 1 fountain, Polaris 220V 1.5HP QT blower

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    Mod Squad Bama Rambler's Avatar
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    Re: air bubbles

    Are you seeing air bubbles in the pump basket on high?
    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

    No I am not seeing them in the pump basket on high. But I didn't look to see if there were air bubbles in the pump basket on low, I just saw them being shot out of the pool jets when on low.

    Thoughts?
    15x32 16k Gal IG riversand (pebblesheen) pool, Filter: Jandy 48 sq ft DE filter, Circulation Pump: Stealth Pump 2 hp 2 speed, SWCG, Heater Size and Electronic Ignition: Jandy LRZ400 Natural Heater, Cleaning System: Polaris 280, Spa: 8 Jets, 1 fountain, Polaris 220V 1.5HP QT blower

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    Mod Squad Bama Rambler's Avatar
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    Re: air bubbles

    If you're seeing a steady stream of bubbles out the returns then you possibly have an air leak somewhere on the suction side. It's common to have bubbles in the pump basket on low but there's shouldn't be a steady stream of them out the returns.
    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

    Wouldn't the lines be the same for both the high and the low speeds? Why would there be no bubbles on high speed coming out of the jet if there was some sort of air leak.
    Maybe I'll clean the pump basket tonight and reseal it and see if it is still there.
    15x32 16k Gal IG riversand (pebblesheen) pool, Filter: Jandy 48 sq ft DE filter, Circulation Pump: Stealth Pump 2 hp 2 speed, SWCG, Heater Size and Electronic Ignition: Jandy LRZ400 Natural Heater, Cleaning System: Polaris 280, Spa: 8 Jets, 1 fountain, Polaris 220V 1.5HP QT blower

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    Richard320's Avatar
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    Re: air bubbles

    Quote Originally Posted by bumdaddy
    Wouldn't the lines be the same for both the high and the low speeds? Why would there be no bubbles on high speed coming out of the jet if there was some sort of air leak.
    Maybe I'll clean the pump basket tonight and reseal it and see if it is still there.
    It's a peculiarity of some variable speed pumps to have bubbles in the strainer on low. But you shouldn't be seeing air out the returns.

    [center:3snrut4t]Round up the usual suspects: low water level, stuck weir in the skimmer, loose drain plugs on the
    pump, poor seal on the pump strainer basket, and leaks at the fittings, especially any couplings.
    [youtube:3snrut4t]vtSmfws0_To[/youtube:3snrut4t][/center:3snrut4t]
    16K freeform gunite with spa; Pentair 4000 DE filter; Century Whisperflow 1 HP; Pentair Minimax heater.
    Troublefree does not mean Maintenancefree. It's like brushing your teeth: You can spend a couple minutes a day and pennies a week or go to the dentist once a year and spend several thousand dollars.
    A pool is like a pet - you have to feed it every day, even the days you don't want to play with it!

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    Mod Squad Bama Rambler's Avatar
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    Re: air bubbles

    We actually haad a case where the pump basket lid seal was leaking on low speed but the increase in suction head on high speed sealed it off. So you can have a leak on one speed and not the other.
    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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    mas985's Avatar
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    Re: air bubbles

    SWCGs will generate bubbles but on low speed they tend to be larger and more noticeable. Turn off the SWCG and see if they go away.

    If that is not the issue, then it is probably a leak. Sometimes pump lids can seal better at high speed than low speed.
    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: air bubbles

    Checked the basket lid seal and the the SWCG, still had bubbles out of the jet. The pool is 6 months old, so they should come out.....

    Help me here, I noticed when I had it on low speed, my filter gauge barely moves up at all, but when I have it on high speed the gauge reads around 15.
    I backwashed the filter last week, but it is probably time to clean the cartridges. Is that normal for there to be no to just a little movement on the gauge in low speed? And could the need to clean the cartridges affect the bubbles on low speed but not high?
    15x32 16k Gal IG riversand (pebblesheen) pool, Filter: Jandy 48 sq ft DE filter, Circulation Pump: Stealth Pump 2 hp 2 speed, SWCG, Heater Size and Electronic Ignition: Jandy LRZ400 Natural Heater, Cleaning System: Polaris 280, Spa: 8 Jets, 1 fountain, Polaris 220V 1.5HP QT blower

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    mas985's Avatar
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    Re: air bubbles

    It is normal to have low pressure on low speed. Head loss/pressure is proportional to the square of the flow rate. Also, most gauges don't read pressure below about 3 PSI.

    Also, I don't think the bubbles are caused by a dirty cartridge. But the air travels through the filter. Have you tried to purged the air out of the filter?
    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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