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Thread: Tiny bubbles in return jets & normal evaporation rates

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    Join Date
    Dec 2011
    Location
    Murfreesboro, TN
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    111

    Tiny bubbles in return jets & normal evaporation rates

    Our IG pool is approx 95% complete. We've got a meeting scheduled for Thursday with our builder for pool school and I wanted to shoot a few questions past you guys so I'd know how concerned I should be about these issues.

    Pluming Configuration: (I can provide pictures upon request)
    Our pool has 2 skimmers, 3 return lines, and a 4th return line that powers a Polaris 280 via a booster pump. The booster pump T's off of the main trunk line exiting the SWCG cell, which also feeds the 3 return lines. There is no isolation valve for the Polaris line so with the main pump on HIGH sometimes the polaris creeps around the pool at very low speed. The main pool pump, 1HP Hayward Super Pump 2-speed, achieves prime quickly and displays minimal bubbles in the leaf basket window.

    The problem if it's actually a problem is that 2 of the 3 return lines burp bubbles. It resembles soda fizz and occurrs with a pulse-like intermittent frequency. You can also hear it if you're close enough. Again, there's minimal air in the pump window so I don't think the skimmers or skimmer lines are sucking air. Can air get trapped in the filter over time? I've programmed the main filter to shut off between midnight and 5am to save electricity. I wonder if the entire pump/filter/heater system is draining overnight and trapping air. If that's the case then I'm not concerned. I just want to make sure this isn't a harbinger of a more expensive problem.

    My other question is regarding evaporation rates. Last Wednesday I noticed the level of our pool had dropped to below the screw on the skimmer box we were instructed to target by our PB. I added an inch of water that night and got the water level about 1cm above the screw. By Sunday evening I noted that the level had returned to it's previous level below the screw. The weather over the weekend was Clear/Dry/Windy with highs in the mid 70s and lows in the 40s. I don't see any obvious signs of bubbles indicating a leak but 3/4 to 1in in 4days seems like too much to just be evaporation. Note: we didn't swim this weekend so zero splash-out. Not sure of the surface area of my pool as it is freeform but the outside dimensions are approx 22x36. What kind of evaporation rates are you guys seeing this time of year? Should I insist on a leak check?

    Other than these two concerns I think the overall build went pretty well and I'm prepared to cut him his final check. Please speak up if you have reservations or suggestions! Any advice would be greatly appreciated.
    22 x 36 In Ground Vinyl - 23K Gal - Saltwater - Tara Liner
    1hp 2-speed Hayward Super Pump, Hayward 6060 Booster Pump
    Hayward SwimClear C3030 Filter, Hayward 400Btu NG Heater
    Hayward Aqualogic PS-4, Polaris 280 Cleaner, ColorLogic 4.0 LED

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    mas985's Avatar
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    May 2007
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    Pleasanton, CA
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    Re: Tiny bubbles in return jets & normal evaporation rates

    Your average evaporation should be around 1/8" per day and this time of year it could be less than that but there are a lot of variables. If it has been winding during those 4 days and the dew point is much lower than the water temp, then evaporation could be unusually high.

    Also, the tiny bubbles out of the return could be due to the SWG. If you turn off the SWG do the bubbles disappear?
    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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    Mod Squad Bama Rambler's Avatar
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    Jun 2009
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    Re: Tiny bubbles in return jets & normal evaporation rates

    The swcg will cause bubbles to come out of the returns, if it's on, but not in a great amount. If you turn off the swcg does bubbles still come out the returns. If so then there's air getting into the system somewhere.

    The plumbing should have been tested prior to being buried so I doubt that's the problem. However all the normal places for leaks should be checked. Pump basket lid o-ring, drain plug(s), Skimmers and weirs.

    That sounds high normal but I'd run a bucket test on it if I were you, to make sure it's not a leak.
    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

  4. Back To Top    #4

    Join Date
    Dec 2011
    Location
    Murfreesboro, TN
    Posts
    111

    Re: Tiny bubbles in return jets & normal evaporation rates

    Thanks for the speedy reply guys. I'll turn off the SWCG this evening to see if the bubbles continue. I know what electrolysis is but I never imagined the voltage of the SWCG was high enough to form a significant number of hydrogen bubbles.

    Given your example of 1/8" water per day, I feel much better about the evaporation issue as well. I'll run the bucket test as a sanity check.
    22 x 36 In Ground Vinyl - 23K Gal - Saltwater - Tara Liner
    1hp 2-speed Hayward Super Pump, Hayward 6060 Booster Pump
    Hayward SwimClear C3030 Filter, Hayward 400Btu NG Heater
    Hayward Aqualogic PS-4, Polaris 280 Cleaner, ColorLogic 4.0 LED

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