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Thread: Blowing and then plugging returns while underwater?

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    Blowing and then plugging returns while underwater?

    A friend and I helped each other close our inground gunnite pools last week and I have a concern. He was comfortable with blowing his returns out while they were still underwater, and then reaching down and capping them while the vacuum was still running.
    I insisted on pumping out my pool below the jets so I had no concerns.
    Do you think he'll be OK, or as a friend should I insist we redo his like mine?
    24k gallon inground with 500 gallon spa, 580sqft Jandy cartridge filter, Jandy ePump 2HP variable speed pump, Jandy 1400 SWG AquaCal Heat Pump, Diamondbrite Aqua Quartz plaster

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    dmanb2b's Avatar
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    Re: Blowing and then plugging returns while underwater?

    Glad to hear everything went OK GSX

    I'd recommend him following your advice. Plugs and even valves can easily leak air, but it is his pool...maybe a friendly nudge.
    24'x52" AGP (13,500 Gallons), Intex SWG, (2)Solar Bear 4x20 panels, Hayward S220T Filter, 1/2hp Pentair Superflo

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    Qwaxalot's Avatar
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    Re: Blowing and then plugging returns while underwater?

    Either way is OK. The real reason to lower the water is to minimize ice damage at the tile and coping.
    If the plugs you use leak, it's not going to matter if you lowered the water or not (the water will rise under the cover).
    In the industry, CSP (Certified Service Professional) by the NSPI and it's successor the APSP. My company services over 600 pools every year. I think the practices regularly espoused on this forum (especially the BBB method) are outstanding; however my comments will be often oriented towards the goal of getting it done, and getting it done right now!

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    Re: Blowing and then plugging returns while underwater?

    I blow mine under water. The fitting on the back of the return is usually a 90 degree ell. That means the pipe generally goes down to the bottom of the pool wall before its starts its horizonal run back to the equipment. If any water gets back down the pipe, its deeper underground anyway and wont freeze. Unless your frost line is deeper than 3 feet or so, its fine.
    14,000 gallon IG, Vinyl. Hayward 3/4 hp superpump, Penatair IC40 SWCG, Pentair automation, Hayward sand filter, Aqua Comfort heat pump, Hayward 400k Lo-Nox LP heater.

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    Re: Blowing and then plugging returns while underwater?

    Thanks for the replies. Sounds like he will be OK. He was last year, but it was so mild in NY last winter that I don't put faith in just that one fact.

    I can also advise not to use an air compressor for blowing your skimmers while trying to catch the Gizmo screw-in plug. The pressure gets too high and the plug can become a projectile!
    Vacuum is more flow, less pressure... but the vacuum didn't have enough oomph to bubble up the main drains under 7-1/2 feet of water, so had to use the compressor there.
    Saved myself a ton of money and further bonded with my pool. We are one now.
    24k gallon inground with 500 gallon spa, 580sqft Jandy cartridge filter, Jandy ePump 2HP variable speed pump, Jandy 1400 SWG AquaCal Heat Pump, Diamondbrite Aqua Quartz plaster

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