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Thread: New DIY Pool Construction - Pressure Loss Question HELP

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    TW Pool's Avatar
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    New DIY Pool Construction - Pressure Loss Question HELP

    Hi all. I am building a new IG pool in the Houston area and have a plumbing questions.

    I had my pool plumbed about 3 weeks ago, just before I went on a vacation/work trip. We've had a ton of rain while I was gone (just putting this out there in case it means something), but nothing has been done on the pool while I have been away.

    I have 2 pumps for my pool...

    1 pump is a waterfall pump that has it's own return and goes straight to the sheer descent (no filtration). It was pressurized to 20 PSI and is still at 20 PSI.

    The main pump (for pool, spa, 2 main drains, 2 skimmers, all returns, and bubblers) started at 25 PSI, but is now a little over 16 PSI. It has slowly dropped. Is this a concern?

    My initial thoughts are that a 40% drop in pressure is bad. However, I'm not sure if some pressure might leak out the skimmers, etc. if they aren't capped off and this is normal.

    Can someone please let me know if I should get the plumber back out? Or is this pretty typical?

    Thanks!
    New DIY IG pool in Houston, Texas. 4/30 dig to 6/11 fill. 20' x 42.5' free form pool/raised spa with the following equipment: 3hp Intelliflow pump shared between pool/spa, 120gpm Pentair Waterfall pump, 6' sheer decent, 2 bubblers, 2 large color LEDs in the pool/1 small in the spa, Easytouch 8 with ScreenLogic2, Stenner Pump, auto fill, a 2HP silencer pump for the spa, 850 sq. ft Sundeck, Dolphin Supreme M500 and a TF100+mixer

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    Mod Squad Bama Rambler's Avatar
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    Re: New DIY Pool Construction - Pressure Loss Question HELP

    How long did it take for the pressure to drop?

    If it took several days then it's probably not a problem, but if it occurred overnight, it's certainly a problem.
    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
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    TW Pool's Avatar
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    Re: New DIY Pool Construction - Pressure Loss Question HELP

    It has been a slow drop. Going on 17 days or more now and I have watched it slowly go down. If both were the same, I would think nothing of it, but the feature pump is holding at 100%.

    Of course, that system is still locked solid. I'm not sure if the main plumbing is sealed. I have to assume the skimmers and possibly the blower could leak pressure.

    I just want to make sure I get any problems fixed (if there are any) prior to laying down my decking!
    New DIY IG pool in Houston, Texas. 4/30 dig to 6/11 fill. 20' x 42.5' free form pool/raised spa with the following equipment: 3hp Intelliflow pump shared between pool/spa, 120gpm Pentair Waterfall pump, 6' sheer decent, 2 bubblers, 2 large color LEDs in the pool/1 small in the spa, Easytouch 8 with ScreenLogic2, Stenner Pump, auto fill, a 2HP silencer pump for the spa, 850 sq. ft Sundeck, Dolphin Supreme M500 and a TF100+mixer

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    Mod Squad Bama Rambler's Avatar
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    Re: New DIY Pool Construction - Pressure Loss Question HELP

    If it's taken it 17 days to drop, I wouldn't be concerned about it. A plug or temporary cap could leak a tiny amount and cause that.

    I'd probably pressurize it back up and see how much it drops in 48 hours.
    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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    TW Pool's Avatar
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    Re: New DIY Pool Construction - Pressure Loss Question HELP

    Thanks Bama!
    New DIY IG pool in Houston, Texas. 4/30 dig to 6/11 fill. 20' x 42.5' free form pool/raised spa with the following equipment: 3hp Intelliflow pump shared between pool/spa, 120gpm Pentair Waterfall pump, 6' sheer decent, 2 bubblers, 2 large color LEDs in the pool/1 small in the spa, Easytouch 8 with ScreenLogic2, Stenner Pump, auto fill, a 2HP silencer pump for the spa, 850 sq. ft Sundeck, Dolphin Supreme M500 and a TF100+mixer

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    Re: New DIY Pool Construction - Pressure Loss Question HELP

    I think your main pump is a variable speed so the obvious question is it still running at the same rpm? If so, for the pump pressure to drop either some restriction was removed from the return side of the pump (eyeballs being forced open, or maybe line to spa opened?) or the suction flow has been reduced. Do you see bubbles in the pump basket, or do you hear the sounds of cavitation at the pump? What has happened to the watts of the pump? If they dropped at constant rpm that would indicate reduced flow, if they increased that would indicate higher flow.
    Cheers, Peter
    20,000 gal, 52'x17' kidney shaped IG, Pebble Tec, IntelliPro P6E6VS4H-209L pump. Intellichlor IC40 SWG.
    300 sf Sta-Rite System 3 cartridge filter. Poolvergnuegen 4-wheel suction pool cleaner. TF-100 test kit.

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    TW Pool's Avatar
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    Re: New DIY Pool Construction - Pressure Loss Question HELP

    Quote Originally Posted by prs View Post
    I think your main pump is a variable speed so the obvious question is it still running at the same rpm? If so, for the pump pressure to drop either some restriction was removed from the return side of the pump (eyeballs being forced open, or maybe line to spa opened?) or the suction flow has been reduced. Do you see bubbles in the pump basket, or do you hear the sounds of cavitation at the pump? What has happened to the watts of the pump? If they dropped at constant rpm that would indicate reduced flow, if they increased that would indicate higher flow.
    The pump isn't running. We are in construction and have the pipes sealed to make sure they aren't damaged by other subs. However, the pressure loss that has occurred, has all happened when no subs have been out since the plumber (long work/vacation trip).
    New DIY IG pool in Houston, Texas. 4/30 dig to 6/11 fill. 20' x 42.5' free form pool/raised spa with the following equipment: 3hp Intelliflow pump shared between pool/spa, 120gpm Pentair Waterfall pump, 6' sheer decent, 2 bubblers, 2 large color LEDs in the pool/1 small in the spa, Easytouch 8 with ScreenLogic2, Stenner Pump, auto fill, a 2HP silencer pump for the spa, 850 sq. ft Sundeck, Dolphin Supreme M500 and a TF100+mixer

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    Re: New DIY Pool Construction - Pressure Loss Question HELP

    In that case a miniscule loss of air or water could cause that pressure reduction, I wouldn't be concerned about it at all.
    Cheers, Peter
    20,000 gal, 52'x17' kidney shaped IG, Pebble Tec, IntelliPro P6E6VS4H-209L pump. Intellichlor IC40 SWG.
    300 sf Sta-Rite System 3 cartridge filter. Poolvergnuegen 4-wheel suction pool cleaner. TF-100 test kit.

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    TW Pool's Avatar
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    Re: New DIY Pool Construction - Pressure Loss Question HELP

    Still holding at just above 16 - so I am guessing there could have been a little settling going on. Thanks for the replies!
    New DIY IG pool in Houston, Texas. 4/30 dig to 6/11 fill. 20' x 42.5' free form pool/raised spa with the following equipment: 3hp Intelliflow pump shared between pool/spa, 120gpm Pentair Waterfall pump, 6' sheer decent, 2 bubblers, 2 large color LEDs in the pool/1 small in the spa, Easytouch 8 with ScreenLogic2, Stenner Pump, auto fill, a 2HP silencer pump for the spa, 850 sq. ft Sundeck, Dolphin Supreme M500 and a TF100+mixer

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    Re: New DIY Pool Construction - Pressure Loss Question HELP

    The extent of my knowledge on this is that I have watched my own pool be built. Given that qualification, why would you not expect your piping to hold pressure for as long as it is being tested? On my pool they pressured up the piping and kept it pressured up until it was time to install the rest of the equipment. In my case, this was about two months. I think it would be prudent to pressure up the system to maybe 50# and look for the leak while you can still get at all the piping. Get some soapy water and look for bubbles. It will be a lot easier now that later. OK, so your leak is a slow leak now, how do you know it won't get worse? Once you find the source of the leak then you can decide if it is no big deal. My two cents.....
    April 1, 2015 first fill of infinity edge of about 15,000 gallons. Aqua Blue Pebble Sheen, iAquaLink, Jandy 2 HP variable filter pump, Jandy 2.5 HP single speed feature pump, Jandy CL580 cartridge filter, Jandy heat pump, Jandy propane heater, spa of unknown size, 3 LEDs in pool, 2 LEDs in surge pond and 1 LED in spa, Eclipse EC-10 Del Ozone oxidizer and 4 Jandy laminars with Jandy CS100 filter built by California Pools in 2015.

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