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Thread: What to adjust first?

  1. Back To Top    #1

    Join Date
    Jun 2010
    Location
    Round Rock, TX
    Posts
    20

    What to adjust first?

    Hello all,
    I just bought a house with a pool (first time owner) last month and have now been reading the forum for a couple weeks (great place you have here btw). Just got my test kit today and did my first test. Took awhile since I read and reread everything, but I think I got it right, although the CH was really high... I was about to give up on the test and start over, but it finally turned blue. Here are my numbers:

    FC: 4.5
    CC: 0.5
    pH: 7.5
    T/A: 130
    CH: 710 (might have mis-counted a drop or two, but it's close)
    CYA: 90

    The pool looks great, perfectly clear. Currently I have an inline chlorinator running with the trichlor pucks, but want to take it offline... Just need to get to the store to buy bleach.

    Anyway, the CH and CYA seem to be the only items that are pretty far out of range. What should I attack first?

    Thanks!
    15K gallon IG gunite with waterfall; 1.5 HP Pentair WhisperFlo pump; Pentair CC200 (200 sf. cartridge filter); 3/4 HP booster pump; Polaris 280; Levolor Electronic Water Leveler

  2. Back To Top    #2
    Melt In The Sun's Avatar
    Join Date
    Oct 2009
    Location
    Tucson, AZ
    Posts
    3,899

    Re: What to adjust first?

    Hi Julio, welcome to TFP!

    Probably not what you want to hear, but...with CYA @ 90 and CH @ 710, I would start by draining about 2/3 of the pool. That will deal with both at once. If you test your fill water's CH, you can get a better idea of how low your CH will go with XX% draining.

    You can post some details (size, filter, pump, finish, etc) of your pool in your signature. At top of screen -> user control panel -> profile -> edit signature.

    Edit: never mind, sig is there already!
    11,200 gal, Pebble-Tec; Tristar 2-speed 1hp - Swimclear 325 ft2 cart - SWG - A & A in-floor cleaner - Heat pump. For the poolside cooking, a Yoder Wichita and a Big Steel Keg!
    TF Test Kits -- PoolMath -- Pool School
    Make each day your masterpiece. - John Wooden

  3. Back To Top    #3

    Join Date
    Jun 2010
    Location
    Round Rock, TX
    Posts
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    Re: What to adjust first?

    Thanks. Yeah, I knew I would have to do a partial drain to take care of the CYA. I'll try to test the fill water this evening and will post results when I have them. We have pretty hard water in central Texas so I suspect the number will be pretty high, but we'll see.
    15K gallon IG gunite with waterfall; 1.5 HP Pentair WhisperFlo pump; Pentair CC200 (200 sf. cartridge filter); 3/4 HP booster pump; Polaris 280; Levolor Electronic Water Leveler

  4. Back To Top    #4

    Join Date
    Jun 2010
    Location
    Round Rock, TX
    Posts
    20

    Re: What to adjust first?

    Ok, had time to test CH of fill water and it came out at 210.
    15K gallon IG gunite with waterfall; 1.5 HP Pentair WhisperFlo pump; Pentair CC200 (200 sf. cartridge filter); 3/4 HP booster pump; Polaris 280; Levolor Electronic Water Leveler

  5. Back To Top    #5
    ssa's Avatar
    Join Date
    May 2010
    Location
    San Jose,CA
    Posts
    26

    Re: What to adjust first?

    210 is not too bad. Agree with Melt In The Sun, partial drain to bring down CYA and CH.
    15x32 vinyl, IG,17K gal, DE filter, Hayward 3/4 HP pump, Hayward Ultra Vac, Solar cover with reel
    SportCount LapCounter, FINIS SwiMP3.1G
    Enjoying my pool thanks to TFP.com

  6. Back To Top    #6
    Melt In The Sun's Avatar
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    Oct 2009
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    Tucson, AZ
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    3,899

    Re: What to adjust first?

    OK, based on 210 fill water, a 60% drain will get you to about 400 ppm CH (familiar with the pool calculator?). If it were me (and if your water's not too expensive) I'd do 2 2/3 drains to get CH down to about 300. However much you decide to drain, keep chlorine in it while you're doing it! The last thing you want is algae in a fresh fill.
    11,200 gal, Pebble-Tec; Tristar 2-speed 1hp - Swimclear 325 ft2 cart - SWG - A & A in-floor cleaner - Heat pump. For the poolside cooking, a Yoder Wichita and a Big Steel Keg!
    TF Test Kits -- PoolMath -- Pool School
    Make each day your masterpiece. - John Wooden

  7. Back To Top    #7

    Join Date
    Jun 2010
    Location
    Round Rock, TX
    Posts
    20

    Re: What to adjust first?

    Thanks for all the info. I am familiar with the pool calculator, but hadn't used it much until now. Great tool, installed the iphone version last night.

    Anyway, my next question... Is it safe to drain the pool this time of year? I've heard stories about plaster cracking and other bad things and I don't want to drain if there is a risk of anything catastrophic.
    15K gallon IG gunite with waterfall; 1.5 HP Pentair WhisperFlo pump; Pentair CC200 (200 sf. cartridge filter); 3/4 HP booster pump; Polaris 280; Levolor Electronic Water Leveler

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