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Thread: new pool help

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    new pool help

    Our pool has been up for about 2 weeks now, and it seems like it is using a lot of chlorine. It is a 12x24 4ft deep. I guess about 6400 gals. It has been shocked when we first set it up, but seems the chlorine disappears rapidly.
    We havn't had any algae blooms, but I am getting worried that it may.
    I test with strips, so I can't tell exactly the stats but here they are after adding enough bleach for ppm of 7
    FC: 5+
    pH: ~7.8
    TA: 220+
    CYA: between 30-50

    Also how long does it usually take for TA to lower using the muriatic acid technique? And does this affect the chlorine significantly?
    I am going to test again first thing in the morning as i added bleach at night.

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    JasonLion's Avatar
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    Re: new pool help

    The lowering TA process takes time. Lowering TA has no particular effect on chlorine.

    Most likely your CYA level is lower than you think it is. Test strips are especially bad at measuring the CYA level.
    19K gal, vinyl, 1/2 HP WhisperFlo pump, 200 sqft cartridge filter, AutoPilot Digital SWG, Dolphin Dynamic cleaning robot
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    Re: new pool help

    How did the cya get that high in two weeks? Did you add it directly yourself or did it come from the chlorine tabs?
    23x40 freeform w/spa, 28,000 gal. PCC-2000 in-floor cleaning. Pebble Sheen w/flagstone coping. 14' weeping wall, (2) 18" sheer descents. Sta Rite- cart 400 sqft. filter, Intellipro VS pump, 1hp (cleaning)2hp (water feature)Max E Pro's. Easy Touch 8 function w/IPod. Rainbow chlorinator, Paramount Clear O3 (I know, I know), Max-E-Therm 400K heater.

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    Re: new pool help

    the cya was added via using Dichlor and Trichlor tabs for the first weeks, now I am switching to Bleach. Also i tested the water this morning before sunlight, and it reads about 4 ppm of FC.

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    Re: new pool help

    If the water was clean when it went in and you've been holding FC up in that 4 to 7 range I'd say an algae bloom is unlikely.

    The most likely sources of "extra" chlorine loss are either low CYA - losing it to the sun or high bather load - it's a smallish pool so a little bather waste goes a long way.

    If you can estimate how much dichlor and how many tabs you can get a fair idea of the exact CYA number. Any estimate on how many ppm of chlorine you loose per day? 2-3ppm would be totally normal.
    16K Gal Plaster | Compupool SWG | Intelliflow VF | TF-100

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    Re: new pool help

    I'll have to test, but when i retested tonight, of course there was a lot of people in the pool today and it has been about 100 outside consistantly it read 0ppm of fc.
    Should I increase the CYA to account for the hot climate and bathing load?
    Also should I go ahead and shock the pool a good time to make sure it is good?

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    Mod Squad jblizzle's Avatar
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    Re: new pool help

    If your FC is zero it is not very safe for people to be in it. And will likely turn cloudy and/or green in the near future.

    You need to get a good test kit. Check the CYA. And then go through the shock process as described in pool school.

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    Jason, TFP Moderator
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    Re: new pool help

    what would cause it to consume so much FC? Is it because there is a biological outbreak starting?

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    Re: new pool help

    Quote Originally Posted by no_Wedge
    what would cause it to consume so much FC? Is it because there is a biological outbreak starting?
    Lots of people, sweat, too much sunscreen, grass on feet getting in the pool, dogs seem to consume a lot of Fc, due to oily hair and dirt I guess. Then, hidden algae on covers, lights, ladders.
    23,000 gallon in ground pool with rock waterfall and spillover spa, Aqualink control system, Polaris 380 cleaner, Purex Triton Clean&Clear Plus cartridge filter. Located in The Woodlands, Texas.

    Pool owner since Nov 2008, Trouble Free since April 2009. Happy to help when I can.

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    Mod Squad jblizzle's Avatar
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    Re: new pool help

    Do an OCLT and you will know if you have something living in the pool consuming the FC.

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    Jason, TFP Moderator
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    Re: new pool help

    i can try that, buy i don't think it will be very accurate with a test strip i'll look into getting a drop test.

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    Re: new pool help

    what would cause it to consume so much FC? Is it because there is a biological outbreak starting?
    Possibly....hard to tell The important thing is to get FC in the pool and keep FC in the pool regardless of the cause of it disappearing.

    Of course I have an agenda in that I sell test kits but you simply cannot accurately manage pool water chemistry with test strips. You are simply guessing at where your levels may be and the test strips don't improve on that much.

    You are correct, don't waste your time trying an OCLT with strips....you can only do that with an FAS/DPD test.

    Shocking your pool correctly is tough as well but you can give it a try with the guess strips if you like. However, don't waste your time again by throwing in "shock" that you buy at the Pool Store.....that is not shocking your pool.

    read "The ABC's of Pool Water Chemistry" up in Pool School then read "How to Shock Your Pool".
    Dave S.
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