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Thread: Woke up to pool 2-3ft low :(

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    Lmlduradenali's Avatar
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    Woke up to pool 2-3ft low :(

    Letís sum this up

    Just bought a home a month ago, all seemed ok, multiport selector valve been sticky and I am thinking just a matter of time and Iíll replace

    Last night I ran backwash for 1 minute, and then the cycle wash off so it will not run until 9AM the following morning. Woke up and oooo dear lord the pool in 2-3ft under....

    Iím lost and donít know why? Will a back gasket cause it to gravity feed backwards even with the pump not running???? Or do I have bigger issues;(


    12k Gallon in ground-hayward prologic controller -Hayward S244T sand filter
    Hayward super pump 1.5
    SWG Hayward T-Cell 9
    K2006C Test kit
    dolphin nautilus plus cleaner

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    Lmlduradenali's Avatar
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    Woke up to pool 2-3ft low ?

    Let me add some info

    It drop 2.3 foot and then it did not drop any more... checked for any visible cracks etc

    Pool is a inground drop in, and about 3 years old...

    Pulled multiport off and the gasket is toast

    Just not sure if that is bad, with the pump off if it will cause like a siphon effect


    Noticed no bubbles the day before the night ( last night this happen)
    12k Gallon in ground-hayward prologic controller -Hayward S244T sand filter
    Hayward super pump 1.5
    SWG Hayward T-Cell 9
    K2006C Test kit
    dolphin nautilus plus cleaner

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    Lmlduradenali's Avatar
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    Re: Woke up to pool 2-3ft low :(

    Things to check? Ideas? I mean itís literally about time to get in and having issues before season;(

    Maybe the backwash sucked a vacuum and drained over night???? Hummm


    12k Gallon in ground-hayward prologic controller -Hayward S244T sand filter
    Hayward super pump 1.5
    SWG Hayward T-Cell 9
    K2006C Test kit
    dolphin nautilus plus cleaner

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    Mod Squad mknauss's Avatar
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    Re: Woke up to pool 2-3ft low :(

    Is your equipment above, at, or below water line in the pool?

    Can you fill out a signature? See Pool School - Getting Started

    Take care.
    6000 Gallon IG Fiberglass with integrated Spa;Pentair CCP240 Cartridge Filter with Pentair Intelliflo VS Pump and HTR250 heater. IC40 SWG. EasyTouch 4. Dolphin Active20 Robot "Roadrunner", TF 100 Test Kit w/SpeedStir!
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    Lmlduradenali's Avatar
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    Re: Woke up to pool 2-3ft low :(

    Base of my sand filter/pump is probably level with the pool, and the the back wash is plumbed under ground and ran 100 ft out the back of my property into the swamp


    12k Gallon in ground-hayward prologic controller -Hayward S244T sand filter
    Hayward super pump 1.5
    SWG Hayward T-Cell 9
    K2006C Test kit
    dolphin nautilus plus cleaner

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    Lmlduradenali's Avatar
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    Re: Woke up to pool 2-3ft low :(

    Iím refilling the pool from the water loss, and I will keep a eye on it. Ordered new multivalve spider gasket, spring and all for the head

    Very strange


    12k Gallon in ground-hayward prologic controller -Hayward S244T sand filter
    Hayward super pump 1.5
    SWG Hayward T-Cell 9
    K2006C Test kit
    dolphin nautilus plus cleaner

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    Mod Squad Texas Splash's Avatar
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    Re: Woke up to pool 2-3ft low :(

    It does sound as though your multiport malfunctioned - either internally getting stuck or the spider gasket itself. Perhaps got stuck in waste mode or created a siphon effect as you noted. Curious, do you have a main drain as well or just a skimmer? In any case, make note of any info on your multiport valve so you can make repairs as soon as possible. If you are able to get a temporary seal on that multiport with the old gasket, maybe try to run it in recycle mode just to keep the water moving for chemical purposes? If you can't, the water should be cold enough to deter algae for a while until you get the valve repaired.
    Pat (a.k.a. Texas Splash) ~ My Pool: Viking Fiberglass; 17,888 Gal; Waterway Supreme 2-sp/2-hp pump; Hayward Ctg filter; TF-100 w/ Speed Stir
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    Lmlduradenali's Avatar
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    Re: Woke up to pool 2-3ft low :(

    Quote Originally Posted by Texas Splash View Post
    It does sound as though your multiport malfunctioned - either internally getting stuck or the spider gasket itself. Perhaps got stuck in waste mode or created a siphon effect as you noted. Curious, do you have a main drain as well or just a skimmer? In any case, make note of any info on your multiport valve so you can make repairs as soon as possible. If you are able to get a temporary seal on that multiport with the old gasket, maybe try to run it in recycle mode just to keep the water moving for chemical purposes? If you can't, the water should be cold enough to deter algae for a while until you get the valve repaired.
    Thanks for reply
    I have a skimmer and below in the deep end is 2 large circles that suck water In as well....

    Itís only went down and the day at that level. Similar to a siphon effect :/ I took multivalve apart and spider gasket is toast and it just flattened out all the way. So I mess with a little reinstalled. Ordered new altogether

    Last night tho level was spot on. Back washed for 2 mins, turned pump off, switch valve back to filter and never started pump back up. Work up this morning to low low pool:/


    12k Gallon in ground-hayward prologic controller -Hayward S244T sand filter
    Hayward super pump 1.5
    SWG Hayward T-Cell 9
    K2006C Test kit
    dolphin nautilus plus cleaner

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    Re: Woke up to pool 2-3ft low :(

    You should put a vacuum breaker on the waste line.

    You can use an air admittance valve from the local hardware store also called a cheater vent, mini vent or in-line vent.

    It's basically a check valve that threads into 1.5" npt threads and allows air in to break a vacuum seal to prevent siphoning but it seals against pressure.

    This also prevents water hammer when you change from backwash or rinse back to filter.

    You put a T in the line with 1.5" female threads pointing up. You can use a special T with slip x slip x thread or slip x slip x slip with a female threaded adaptor to screw the vent into.

    Until you get a vent, remove the sight glass after rinse but before changing back to filter. This will break the seal and allow the waste line to drain.

    You can also put a ball valve on the line as extra precaution and a union so that you can check for leaks.
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    Lmlduradenali's Avatar
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    Re: Woke up to pool 2-3ft low :(

    So does this cause what happen


    12k Gallon in ground-hayward prologic controller -Hayward S244T sand filter
    Hayward super pump 1.5
    SWG Hayward T-Cell 9
    K2006C Test kit
    dolphin nautilus plus cleaner

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    Re: Woke up to pool 2-3ft low :(

    The bad seal at the multiport caused the problem. A vacuum breaker would have prevented the siphon.
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    Lmlduradenali's Avatar
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    Re: Woke up to pool 2-3ft low :(

    Dang


    12k Gallon in ground-hayward prologic controller -Hayward S244T sand filter
    Hayward super pump 1.5
    SWG Hayward T-Cell 9
    K2006C Test kit
    dolphin nautilus plus cleaner

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