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Thread: Partial drain/refill

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    Partial drain/refill

    I need to do this to lower my CYA. But I'm not sure exactly HOW to do it. Do I set my filter to waste? Will the pump turn off then the water level gets too low? Then I need to refill, recirculate, and then drain again?
    27' round AG, sand, Ohio, well water, 19,000 gallons approx., New owners to the pool.

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    frustratedpoolmom's Avatar
    Join Date
    May 2007
    SWSuburban Chicago, IL

    Re: Partial drain/refill

    Yes, and you should turn it off before it runs dry, and then refill, recirculate, RETEST and maybe repeat.
    Helpful links: Pool School; CYA/Chlorine Chart
    24' round AG pool, 52" high, Raypak heater; Waterway 2 spd Pump;
    150 Sq ft. Clearwater Cartridge Filter; Former and DISSATISFIED "Pool Frog" owner
    Perfectly Clear Pool Service, Find me on Facebook!

  3. Back To Top    #3

    Re: Partial drain/refill

    hahaha, I'm sure I'll need to do it several times. My CYA was 85 last I checked! Thanks for your help!
    27' round AG, sand, Ohio, well water, 19,000 gallons approx., New owners to the pool.

  4. Back To Top    #4

    Join Date
    Jan 2009
    Cupertino, CA

    Re: Partial drain/refill

    So if you're targeting say 60, then you need to replace about 30% of your water or 5700 gal. With a 27' round it looks like you need to lower your water level about 16" if you do it all in one go. If you do it in multiple stages you'd have to replace more water in total.

    Pumping to waste is fast but if you don't have a main drain or can't shut off the skimmer then you won't get all that far. You could siphon with garden hose all you want, it's just going to be a little slower; I suppose you could do several in parallel.

    Where is all this water going? Some jursidictions require that draining a pool has to go into the sewer, not on the ground or street (storm drain).
    BBB "Intermediate Swimmer"
    IG plaster pool 18.5K gal, Hayward Pro-Grid DE filter, 3/4 HP Hydramax II; Polaris 380, 3/4 HP booster
    AG spa 325 gal, probably Sundance of some kind
    Water testing instructions on one page

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