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Thread: Small Bubbles Emitting From Return Jet

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    Small Bubbles Emitting From Return Jet

    I've noticed small bubbles emitting from two of my 5 return jets at pump start up. They continue for approximately 30 minutes and then almost disappear completely. My water level is perfect so air is not entering through the skimmers. What other culprits should I investigate?

    Thanks!
    28k gallon in-ground pebbletec pool w/waterfall and grotto feature
    Triton II sand filter
    "The Pool Cleaner" 4-wheel vacuum
    1.5hp main pump; 1.5hp water feature pump
    Taylor K2006 test kit

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    Mod Squad jblizzle's Avatar
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    Re: Small Bubbles Emitting From Return Jet

    Do you have a SWG? I can't see signatures on my phone.

    Do you see air in the pump?
    Does the filter drain when the pump is off?
    Jason, TFP Moderator
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    Re: Small Bubbles Emitting From Return Jet

    My pool is non-SWG.
    "See air in the pump." Do you mean by looking through the top of the pool pump's basket?
    Does the filter drain when the pump is off?" I have a Triton II sand filter. How would I determine if it drains when the pumps are off? Your question spurred a memory in my mind. When I stand next to the filter with the pumps off, I can faintly hear a sound that resembles slowly moving water. It almost sounds as if it's draining. I don't know where the water could be draining to because the water level in the pool isn't noticeably dropping.

    Thanks for your help.
    28k gallon in-ground pebbletec pool w/waterfall and grotto feature
    Triton II sand filter
    "The Pool Cleaner" 4-wheel vacuum
    1.5hp main pump; 1.5hp water feature pump
    Taylor K2006 test kit

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    Mod Squad jblizzle's Avatar
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    Re: Small Bubbles Emitting From Return Jet

    Yes I mean in the top of the pump basket.

    You know it is draining if you see air go into the pool when the pump turns back on, or if you open the air relief valve on the top of the filter with the pump on and air comes out.
    If you hear water moving when the pump is off, then I am guessing you have a leak somewhere that is allowing air into the system and letting the filter drain back to the pool.
    Jason, TFP Moderator
    18k IG pebblesheen pool, Hayward ProLogic P4 w/ T-15 SWG, Pentair 1HP 2-speed Superflo, Hayward 6020 DE filter
    500 sqft Heliocol solar panels, ThePoolCleaner, TF-100 test kit w/ SpeedStir
    Pool School + Test Kit + PoolMath = A TROUBLE FREE POOL
    If you found TFP helpful and we saved you money ... Become a TFP Supporter!

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    Re: Small Bubbles Emitting From Return Jet

    Is the sound you hear, something like, 'blump' pause 'blump' pause?
    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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    Re: Small Bubbles Emitting From Return Jet

    Quote Originally Posted by pabeader View Post
    Is the sound you hear, something like, 'blump' pause 'blump' pause?
    I just placed my left ear onto the sand filter and intermittently - say, every 20 seconds - I could hear what you described as a "blump," then pause. One might describe it as a "blurp," but we would be splitting hairs. Thoughts?

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    Re: Small Bubbles Emitting From Return Jet

    I may have found the culprit. The "cap" on top of my Triton II sand filter may have a very small leak. I'll attach pics.

    A few points of reference:

    When I start the pump, there is a pocket of air inside the pump's basket that disappears after a few seconds.

    When I look at the pressure gauge on top of the filter, it never moves after turning the system on.

    When I unscrew the air pressure while the pump is running, I hear a loud squeal and air, not water, is released.

    There is a clear plastic portion of the pressure gauge in between the gauge and the air release nob. When the pumps are running, I don't see water but rather small drops jumping inside. I'm not sure if this is supposed to be full of water to the top or if this is normal.

    Top of filter leak:



    From the front:

    uploadfromtaptalk1463639082699.jpg

    Air inside pressure gauge:



    Bubbles emitting from return in deep end:

    uploadfromtaptalk1463639214345.jpg



    28k gallon in-ground pebbletec pool w/waterfall and grotto feature
    Triton II sand filter
    "The Pool Cleaner" 4-wheel vacuum
    1.5hp main pump; 1.5hp water feature pump
    Taylor K2006 test kit

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    Re: Small Bubbles Emitting From Return Jet

    You found the source of the air. That sound you are hearing is water slowly returning backwards into your pool. This is creating the air bubble in the filter. As it runs, the pump is driving the air out and that's what you are seeing from the returns. I have a similar problem with mine. I don't know 100% for sure, but I would bet that sight glass is supposed to be full.
    With the pump running, if you open the air release until water come out of it. Then close it again, I bet the bubbles will quickly stop at the return. Once full, you may find where water is leaking from the system and therefore the source of your air.
    Do you see any drips, anywhere while the pump is running?

    Also, I see that your pressure gauge is showing around 10psi. Does it always show that, even when the pump is off? If so, it probably needs to be replaced. (Tftestkits.net has soem nice ones!)
    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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    Re: Small Bubbles Emitting From Return Jet

    Yes, the pressure gauge always stays at 10psi. I suspect it's due to the air leak in the filter's closure top.

    No other drips can be found within the pool's plumbing.

    I just purchased this via Amazon: Amazon.com: Pentair 154856 Black Buttress Thread Closure Replacement Kit Triton Pool and Spa Filter: Patio, Lawn Garden
    28k gallon in-ground pebbletec pool w/waterfall and grotto feature
    Triton II sand filter
    "The Pool Cleaner" 4-wheel vacuum
    1.5hp main pump; 1.5hp water feature pump
    Taylor K2006 test kit

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    Mod Squad kimkats's Avatar
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    Re: Small Bubbles Emitting From Return Jet

    If you gauge is not moving at all (does it drop back down to 0 when you turn the pump off?) you need a new gauge. I know I was lucky to get 6 months out of the non-filled ones. I have one of the filled ones now and it is NICE and it has already lasted longer than any of the non-filled ones!

    Kim
    TFP Moderator 33x52 round AG 25,600 gals Sand Filter 1.5hp Pump - 2 Speed, SLAM, Pool School, Recommended Levels, Recommended Chemicals, Pool Math, Chlorine/CYA Chart, TF-100 Test Kit

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    Re: Small Bubbles Emitting From Return Jet

    Quote Originally Posted by kimkats View Post
    If you gauge is not moving at all (does it drop back down to 0 when you turn the pump off?) you need a new gauge. I know I was lucky to get 6 months out of the non-filled ones. I have one of the filled ones now and it is NICE and it has already lasted longer than any of the non-filled ones!

    Kim
    I replaced the filter's closure cap and the gauge is now working perfectly. With the filter off, it sits at 0. When I turn it on, it moves between 15-20. What continues to baffle me is the small bubbles emitting from the returns immediately after my pump primes (approximately 10 seconds). I can't find a single leak anywhere in the above ground plumbing. And I performed a bucket leak test during live and idle filtration cycles (no leak). There are some bubbles in the filter pump's clear cap/top. Is it possible I'm sucking in some air during priming?

    28k gallon in-ground pebbletec pool w/waterfall and grotto feature
    Triton II sand filter
    "The Pool Cleaner" 4-wheel vacuum
    1.5hp main pump; 1.5hp water feature pump
    Taylor K2006 test kit

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    Her pool boy's Avatar
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    Re: Small Bubbles Emitting From Return Jet

    I was having the same problem yesterday and after checking and replacing the swimmer socks it went away. One of my socks had become clogged and was restricting suction. Not sure if that is your problem but it was causing exactly what you were describing. Now it is running clear with no bubbles.
    SteveS

    16' x 50' - 95K L (25000 gallon) I.G. Vinyl liner 12.5 Liquid Chlorine
    Wicor Pantera P24 Sand Filter Pentair Superflo Variable Speed Pump
    Zodiac 3510WD Robotic Cleaner Raypak R336A Heater. ​Taylor K2006c test kit

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    Re: Small Bubbles Emitting From Return Jet

    Quote Originally Posted by Her pool boy View Post
    I was having the same problem yesterday and after checking and replacing the swimmer socks it went away. One of my socks had become clogged and was restricting suction. Not sure if that is your problem but it was causing exactly what you were describing. Now it is running clear with no bubbles.
    Hmm, I'll check that possibility out later when I'm home. Appreciate that advice.

    28k gallon in-ground pebbletec pool w/waterfall and grotto feature
    Triton II sand filter
    "The Pool Cleaner" 4-wheel vacuum
    1.5hp main pump; 1.5hp water feature pump
    Taylor K2006 test kit

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    Her pool boy's Avatar
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    Re: Small Bubbles Emitting From Return Jet

    And of course I meant "skimmer"' lol. Curse you auto correct.
    SteveS

    16' x 50' - 95K L (25000 gallon) I.G. Vinyl liner 12.5 Liquid Chlorine
    Wicor Pantera P24 Sand Filter Pentair Superflo Variable Speed Pump
    Zodiac 3510WD Robotic Cleaner Raypak R336A Heater. ​Taylor K2006c test kit

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