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Thread: Question about draining pool

  1. Back To Top    #1

    Join Date
    May 2010
    Location
    Las Vegas, Nevada
    Posts
    2

    Question about draining pool

    A few days ago I received my new new test kit from TFTestKits. Right away it was obvious that I need to replace a good amount of the water in my pool. My CYA measurement is 1/2" below the 100 mark. Since it looks like a logarithmic scale, I fear that the actual CYA significantly higher than 100. Also, my TA measurement is 380. As you can imagine I am having problems with both algae and scaling.

    I know I have to drain the pool, but I'm not sure how much water to replace. It is a 20,000 gallon plaster/gunite pool. I live in Las Vegas and I am not too worried about my pool floating away if I drain too much water. Is it best to take all the water out and start over?

    Now to the meat of my question. When the pool was being built I remember that one of the things I had to wait on was the sewer hookup. Since there doesn't seem to be anything to do with sewer drains around the pool equipment, is it possible that my plumbing is already connected to the sewer? All of my valves past the pump are accounted for and control things like spa/water feature/inground cleaner/solar heater. On the intake side, there is one path which is never used. I will attempt to attach a picture with 2 valves marked A and B. The A valve controls whether to pump the water from the spa or main pool skimmers. It is shown in the main pool position. The B valve is the one I never touch and currently pumping water from the main pool skimmers. My gut says that the sewer drain pipe is accessed with the other B valve position. However, my knowledge of fluid mechanics doesn't allow me to get my brain around how this could work. The other "unknown" pipe is a slightly smaller diameter than all of the other pipes. Am I completely off base?

    I would rent a pump from home depot but I have looked around and I'm not sure where I would access the sewer drain directly. I would call the pool builder and ask them but they are no longer in business.

    Thanks for any input you can give.

    Tedd
    [attachment=0:3k1fdcl8]IntakeValves.JPG[/attachment:3k1fdcl8]
    Attached Images Attached Images
    18000 gallon pool, below ground, plaster, SWG, Zeosand filter

  2. Back To Top    #2

    Join Date
    Jul 2009
    Location
    Seattle
    Posts
    87

    Re: Question about draining pool

    You don't say what kind of filter you have but the sewer hookup implies that it is sand (or maybe DE). Please fill in some details.
    20,000 Gallon kidney sort of a sand filtered gunite in ground pool w/ hot tub.

  3. Back To Top    #3
    JasonLion's Avatar
    Join Date
    May 2007
    Location
    Silver Spring, MD
    Posts
    37,887

    Re: Question about draining pool

    The line to the sewer, if there is one, would tend to be right before the filter, not in the area you have pictured.
    19K gal, vinyl, 1/2 HP WhisperFlo pump, 200 sqft cartridge filter, AutoPilot Digital SWG, Dolphin Dynamic cleaning robot
    Creator of PoolMath and Pool Calculator. Other handy links: Support this site, TF Test Kits, Pool School

  4. Back To Top    #4

    Join Date
    May 2010
    Location
    Las Vegas, Nevada
    Posts
    2

    Re: Question about draining pool

    The filter is a Pentair Cartridge filter.

    I'm not sure what other details to add. I will get all of my pool details into the signature soon.

    Jason, yes I would also expect the sewer line to be closer to the filter. But there isn't anything there that I cannot immediately identify. The only thing in the whole mess that I can't identify is that one pipe on the intake side.

    Tedd
    18000 gallon pool, below ground, plaster, SWG, Zeosand filter

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