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Thread: Friend's new pool

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    jmcdtucson's Avatar
    Join Date
    Jun 2014
    Tucson, AZ

    Friend's new pool

    My friend just bought a house with a pool. Pool was clear when they looked at the house but by the time they moved in it was green. He shocked it and that helped, but it was still very cloudy (3-4 ft. visibility).

    18,000 gallon in-ground plaster pool with no SWG.

    I took my TF-100 kit over and got these readings

    CYA: 35
    FC: 1
    CC: 1.5
    TA: 100

    I didn't get a Ph reading unfortunately. I'm also a little suspicious of my CYA reading as it seems to be reading low this year (regents are one year old) and tests from the pool store and a pool guy registered from 60-100. He has a Taylor kit on order and we'll double-check tomorrow.

    He added about 4 gallons liquid chlorine to bring it up to SLAM level (we did the math on PoolMath). The next day it was down to 7 ppm. The water looked better (maybe 6 ft. visibility). Then he added another dose (same amount) this morning at 10am. 3 hrs. later it was down to 1 again (his measurement, but I'm sure he got it right).

    Is it possible for a pool to drop about 18 ppm in 3 hours?

    He's of course worried about whether this is working. I think the SLAM should continue. Any thoughts?

    Also he's away for a month so is getting this company to take care of the pool. We got a good reference. Any one know about it? They use chlorine gas.

    Intex 12'x24'x52"
    8,403 gallons
    Intex SF60110 2450 GPH Sand Filter
    Intex CS8110 SWG
    Aquabot AJET121I Pool Rover S20-40

  2. Back To Top    #2
    Mod Squad kimkats's Avatar
    Join Date
    Jul 2012
    Tallahassee, FL

    Re: Friend's new pool

    Trust YOUR test results or his when his kit comes in.

    The SLAM does work.

    His FC is dropping because it is work HARD to clear his pool. Tell him to keep it up.

    Show him this link so he can SEE that TFP knows what it is talking about.

    Recovering my old inspirational links

    I have no idea about the company or what they use so will not comment on it.

    TFP Moderator 33x52 round AG 25,600 gals Sand Filter 1.5hp Pump - 2 Speed, SLAM, Pool School, Recommended Levels, Recommended Chemicals, Pool Math, Chlorine/CYA Chart, TF-100 Test Kit

  3. Back To Top    #3
    BoDarville's Avatar
    Join Date
    Jun 2012
    DFW, Texas

    Re: Friend's new pool

    Trust your test results over the pool store's. It's not unusual for the pool store to measure CYA significantly higher than it actually is - it's happened to me in the past.

    Chlorine losses like you have described are not unusual during the initial part of the SLAM. Those losses will become smaller as the pool clears up. Keep in mind that the most important part of the SLAM is the M for Maintaining the chlorine as close to the SLAM target as possible throughout the entire process until the 3 criteria of Done are met.
    Gold Supporter, TFP Lifetime Supporter, 26,680 gal Plaster IGP 3.5 - 10' depth / Attached Waterfall Spa, Manually Chlorinated, Triton Sand Filter, 1.5 HP * 1.1 SF = 1.65 SFHP 1-speed Pentair WhisperFlo WF-26 Pump, 400K BTU NG Teledyne Laars Series One Heater, Polaris 360, Test Kit Comparison, Chlorine/CYA Chart, SLAMing Your Pool, OCLT
    A good test kit is an investment, not an expense.

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