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Thread: I lost 3" water in 6 hours

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    I lost 3" water in 6 hours

    Hi People,

    Figured Id try this forum for my problem. Pool pump runs well but last day or so of filtering I lost a whopping 3" or so of water! Checked the "spider" gasket under sand filter valve, its ok. It was new early summer. Cant find any other leaks. Have 2 wear spots on base of pool (marcite) Could it be draining from there? Those spots have been there for years.....yes, they are getting worse.

    Thanks!
    16,000 gal in ground, marcite. FL.

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    Mod Squad JohnT's Avatar
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    Re: I lost 3" water in 6 hours

    Welcome to TFP.

    Did you check your waste line for leakage while the pump is running?
    TFP Moderator
    20K Gallon 20X36 Vinyl Inground
    Hayward S244T Sand Filter with 1HP Whisperflo Pump. Liquidator C-201 and Solar Heat

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    Mod Squad Bama Rambler's Avatar
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    Re: I lost 3" water in 6 hours

    Welcome to TFP.

    Does it lose more with the pump running than with it off?

    Have you checked around the equipment pad for damp places?

    Give us a little more info and we can help you find where it's going.
    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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    Re: I lost 3" water in 6 hours

    Does it stop losing water below the skimmer/returns?
    1971 San Juan Fiberglass pool 12,000 gallons
    New Pentair Whisperflow 1hp
    New Pentair FNS DE filter 64sq
    All 1.5" piping and no heater
    1 skimmer, 1 main drain, and 2 returns

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    Re: I lost 3" water in 6 hours

    Wow.....so much help here!! Sorry for delay, people....I had an errand to run.

    It loses water only while pump running, I believe. No water signs anywhere (spills, puddles, etc).

    I can not see into the waste line....it goes into the ground and gets lost somewhere on the large property. I know it does NOT drain in the sewer......

    Thanks!
    16,000 gal in ground, marcite. FL.

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    Re: I lost 3" water in 6 hours

    I know that when I backwash, the cylindrical gllass "window" shows dirty water/sediment swirling around before it gets dumped, I guess. Well, that glass see thru does not have water visible during the pump running/loss of water, if that says anything. (I believe that IS the wast tube/drain line, eh?)
    16,000 gal in ground, marcite. FL.

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    Mod Squad Bama Rambler's Avatar
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    Re: I lost 3" water in 6 hours

    The sight glass you're talking about is the waste line. Just because you can't see any water in it when you're running normally doesn't mean that it's not leaking some water out. It's up on the side of the pipe so if there was a trickle of water out it, you wouldn't see it. You can remove it and shine a flashlight in there while running the filter and maybe see if any water is leaking out the waste line.
    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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    Re: I lost 3" water in 6 hours

    Quote Originally Posted by Bama Rambler
    The sight glass you're talking about is the waste line. Just because you can't see any water in it when you're running normally doesn't mean that it's not leaking some water out. It's up on the side of the pipe so if there was a trickle of water out it, you wouldn't see it. You can remove it and shine a flashlight in there while running the filter and maybe see if any water is leaking out the waste line.
    Good tip, Bama. I will try this tomorrow in the daylight. So, I should be able to just unscrew that glass, counter clockwise? Might it be cemented in?
    16,000 gal in ground, marcite. FL.

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    Re: I lost 3" water in 6 hours

    Quote Originally Posted by vln
    Does it stop losing water below the skimmer/returns?
    Hmmm, goos point, vin. Right now, its not so bad that the water level is below the side wall skimmer. So, could that indicate a possible problem with the skimmer then? If so, where would the water go, I mean, would it be wet/puddle anywhere?

    Thaks!!

    PS : I have stopped everything right now pending advice.........
    16,000 gal in ground, marcite. FL.

  10. Back To Top    #10

    Re: I lost 3" water in 6 hours

    OK....got that sight glass out..it came out so easy, and looked inside while the pump was running, and no water being lost from there. The mystery goes on.....
    16,000 gal in ground, marcite. FL.

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    Heckpools's Avatar
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    Re: I lost 3" water in 6 hours

    thats alot of water to lose in 6 hrs...

    if your 100% positive no leakage from backwash line, seems to me you may wanna have a professional do a pressure test to your underground plumbing lines.

    Check online for pool companies in your area with good customer reviews..googlmaps is a good place to start. Dont just hire the first one you speak to. Feel them out... ask a few questions on the phone.
    [center:3gj9kdnn]Matt Heck
    "HECK OF A POOL SERVICE LLC"
    Serving Ocean co. NJ
    COMPANY INFO BELOW
    http://maps.google.com/maps/place?hl=en ... 2995187987[/center:3gj9kdnn]

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    Mod Squad Bama Rambler's Avatar
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    Re: I lost 3" water in 6 hours

    I agree with Matt, might be time to call someone. However if you have a good understanding of how to pressure test the lines and a little equipment to do it with you can do it yourself.
    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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    Re: I lost 3" water in 6 hours

    Thanks, guys. Maybe its time.......
    16,000 gal in ground, marcite. FL.

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    Re: I lost 3" water in 6 hours

    OK, update: The pool is in limbo, I am just watching it......hoping for a clue as to what to do next. Water level is lower every day, pump off/not running anymore, also because the water level is below the intake on the side of the pool.

    Water yesterday was at the top side of the round underwater light. Today it is say, 1/2" below.a FRIEND SAID HIS POOL leaked and the pool guy found a bad gasket at the light. But, in my case, I doubt it as the light has nothing to do with the motor running and accelerating the water loss, right?? I mean, what would the light/gasket have to do with draining WHILE the pump runs?
    16,000 gal in ground, marcite. FL.

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    Mod Squad Bama Rambler's Avatar
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    Re: I lost 3" water in 6 hours

    It might be possible to have multiple leaks. A small one at the light and a larger one in the plumbing. It could also be a fluke that the water seemed to leak more with the pump running than with it stopped.

    Wait and see if the leak stops at or near the bottom of the light and that'll at least let you know if the light is part of the 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
    Pool School ----- Pool Math ----- TF-Test Kit

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    ivyleager's Avatar
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    Re: I lost 3" water in 6 hours

    I know you said there is no puddle or wet area around equipment, but TWICE this year my screw cap located at bottom side of sand filter cracked and had a slow leak- drip. There wasn't alot of wetness, just a bit. I thought I had a plumbing leak, too. I was filling about 2 inches/week, which is what I usually fill in a month of DRY weather. My point is, double check topside equipment. Hope this helps and good luck.
    CaryB
    36 x 18 IG vinyl, 25K, 1 HP pump, sand filter
    1 skimmer, 2 returns, no main drain
    Old school: PoolSolutions test kit

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    Re: I lost 3" water in 6 hours

    OK, bama, and ivy. Yup, thats what I'll do.....Im monitoring the level (no hurry), and when it hoit below that light, I will know more, and report back. I'll be on the lookout!!
    16,000 gal in ground, marcite. FL.

  18. Back To Top    #18

    Re: I lost 3" water in 6 hours

    All this advise sounds right, always check to see where the water stops leaking. IE: Skimmer, light, then main drain? If the water stops at the skimmer and it's not the skimmer, you can hire a leak detector to come out and do a full inspection of your pool. Good luck!

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    Re: I lost 3" water in 6 hours

    OK, now Im well into my research on the leaky pool source, and heres where Im at: The water level seems to have stopped almost completely (except for residual evaporation, maybe 1/16" per day??), and the water is now at the bottom of the light. Looks like the light is the source , educated guess. So, I have little to lose by replacing gasket, and hey, the bulb was dead, so Ill put in a new one too. Now, I have to reach down the total length of my arms to undo it.

    I will shut off breaker, and see what is inside there. lets say the leak WAS the gasket. Why would the leakage apparently flow greater with the pool pump on??? Thats what puzzles me. Also, once water seeps through that gasket, where does it go? Into the dirt?

    Thankjs!
    16,000 gal in ground, marcite. FL.

  20. Back To Top    #20

    Join Date
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    Re: I lost 3" water in 6 hours

    Your description of the light has a me a little confused. Also, i cant tell from your post's but is this a concrete pool or fiberglass? The niche that your light fits into is usually a wet niche. In other words, there is supposed to be water in there. I'm not sure of the gasket you mention. Usually, the gasket on a light keeps water out of the fixture itself. A bad gasket will only let water into the light housing, but wouldnt cause a leak. The main cause of a leak around a light is either
    1) a cracked housing allowing water to leak out that way, or

    2) a cracked conduit that goes out the back of the housing. The conduit leads to a deck box that connects to the main line back to the power source. If the conduit is cracked, water will leak out the back of the light niche.
    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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