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Thread: Please help my sisters pool

  1. Back To Top    #1

    Join Date
    May 2008
    Location
    Southern Connecticut
    Posts
    56

    Please help my sisters pool

    I'm went to my sister's house tonight and she just bought the house. There is an inground pool (30ftx17ft 3.5ft to 5.5 ft depth) that they are trying to open. I believe its a sand filter and there is aquarite SWG. I took my TF-100 and tested their water. They pour liquid chlorine and algeacide in the pool on thursday

    Test results from today:
    Chlorine 0
    pH 8.2
    TA 30
    CH 30
    CYA 0
    Temp: not sure
    salt 940 (test strip) unit says 1300

    Just now we put in 20 lbs of salt and 2 bottles of shock.

    I'm not sure where to start as I'm not sure how similar inground and above ground pools are. Their neighbor told them that there is always a cloudiness to the pool which I told them that the water would be crystal clear when we are done.
    18' Willow round AG 52", 19" Sand filter 1 hp pump, Intex SWG 8110, Bought and install May 08
    New 12'x16' deck built March 09
    Poss thinking about solar panels next!

  2. Back To Top    #2

    Join Date
    Jan 2009
    Location
    Cupertino, CA
    Posts
    1,966

    Re: Please help my sisters pool

    Well, you need to lower pH to the mid-7's and raise everything else. See the Pool School SWG article for specifics.

    I'm not aware of any difference between inground and aboveground as far as chemistry goes; the pool surface material (plaster, vinyl, fiberglass) makes some difference.
    --paulr
    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

  3. Back To Top    #3
    JasonLion's Avatar
    Join Date
    May 2007
    Location
    Silver Spring, MD
    Posts
    37,879

    Re: Please help my sisters pool

    You need to get the PH and TA at least plausible right away. You need to have a care with PH when the TA is that low. I suggest raising the TA to about 50 (which will make adjusting PH simpler), then lower the PH to about 7.2, then raise the TA to about 80, and finally double check the PH to be sure it is still plausible. Remember that the PH test is not reliable while FC is above 10.

    Raise CYA up to about 80, but do it in perhaps three steps. The first step should be done right away and raise CYA to around 30. That will make killing all the algae much simpler.

    Then finish killing all the algae.

    After that, you can work on the second CYA increase, any final adjustments to the salt level, and startup the SWG.
    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 2008
    Location
    Southern Connecticut
    Posts
    56

    Re: Please help my sisters pool

    ok thanks...i forgot to mention the pool has a vinyl liner
    18' Willow round AG 52", 19" Sand filter 1 hp pump, Intex SWG 8110, Bought and install May 08
    New 12'x16' deck built March 09
    Poss thinking about solar panels next!

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