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Thread: GEting pool chemistry balanced

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    Join Date
    Jul 2013
    Location
    Oklahoma City
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    GEting pool chemistry balanced

    Hello...newbie here, and first time pool owner, came with house and has unknown history, the the previous owners left a tub of 1 inch chlorine tablets, which I continued to use in the floater.

    The good - the pool doesn't smell bad in any way, water is clear and no algae,

    I'm not sure if I'm having trouble or not, I've been using Aquacheck Select 7-Way Test Strips, and I got very very high CYA readings, more or less of the scale, so I read a bit about that, and then drained off around half of the pool water, tested over several days and the CYA has gone down, but still isn't great. The problem is that when I add chlorine (using the 1" tabs) the FC and TC seem to go up together in step, is this normal?

    I have shocked, double shocked, (I'm aware this now adds to the CYA), and it still happens, and the strips is seem to indicate that my pH was getting lower, so (see 7/11/12 below) so I added about a box of 20 mules and this has raised the pH a little and the TA, and my TC/FC and at the high end now, but still within the "OK" on the test strips.

    I now want to work towards using household bleach, liquid chlorine approach which many of you recommend on here, how balanced do I have to get my current chemistry before making the switch? Do I have to drain the pool?

    Pool temp is usually between 81-83F.
    Date Hardness TC FC pH Total Alkalinity Cyanuric Acid

    Before 50% pool drain 300-500 0.5 0.5 7.2 80 300
    7/1/2013 300-500 0.5 0.5 7.2 80 100-150
    7/2/2013 300-500 0.5 0.5 7.2 80 100-150
    shock 7/3/2013 300-500 2 1 7.3 80 100-150
    7/4/2013 300-500 1 1 7.2-7.8 80 100-150
    7/5/2013 (added more tablets) 300-500 1 3 7.2-7.8 80 100-150
    7/6/2013 (added more tablets) 300-500 1 3 7.2-7.8 80 100-150
    7/7/2013 300-500 3 3 6.8 80 100-150
    7/8/2013 shocked 300-500 5 5 6.8 80 100-150
    7/9/2013 300-500 5 5 6.8 80 100-150
    7/10/2013 300-500 5 5 6.8 80 100-150
    7/11/2013 after double shocked 300-500 5 5 7 100 100-150 (also added 3/4box of 20 mules)
    Pool size in gallons - 13,640
    Filter type - Pentair Sand
    In ground
    Plaster/pebble, approx 33ft x 11ft
    Hayward SP2607X10 Super Pump 1-HP Max-Rated Single-Speed
    Age - not sure, most likely ~20 years

  2. Back To Top    #2
    Smykowski's Avatar
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    Re: GEting pool chemistry balanced

    TC=FC+CC, so if you add Free Chlorine, by definition Total Chlorine will go up as well.

    In terms of making the switch, all you have to do is commit. Then you need to buy a good test kit, because maintaining the pool our way is impossible with strips or pool store testing.

    Given your struggles, I would then suggest SLAMing the pool. Read about it in Pool School, and ask us any questions that come up.

    Welcome to TFP!
    33' round, 23,000 gal AG vinyl , 1HP 2spd PowerFlo Matrix downsized with 3/4HP impeller (X2), Hayward S180T 150# sand filter (X2), Hayward H250 NG heater Pool Store year 1 - $850 for 2 months; Pool Store year 2 - $440 for 2 months, TFPC year 1 - $170 for 4 months; TFPC year 2 - $95 for 4.5 months
    The most important article on this site - The ABCs of Pool Water Chemistry

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    Isaac-1's Avatar
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    May 2010
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    Re: GEting pool chemistry balanced

    My first suggestion is to get one of the suggested test kits and stop using trichlor tablets. Test strips are bound to lead to confusion, frustration, and wasted money on chemicals one way or another.

    Ike

    p.s. I assume you have already read the pool school link in the upper right, but if not read it
    Indoor 20x40 35,000 gallon vinyl pool with 1.5 HP 2 speed Jandy FloPro pump, Hayward EC75 Perflex DE filter, 11 4x12 Techno-Solis solar panels w/ Aquasolar controller, Aquabot Turbo T Robot Cleaner. Also LMI metering chlorine dispenser pump and HotSpring Jetsetter
    I use and endorse TFtestKits TF-100 from http://tftestkits.net
    ~Remember TFP counts on your donations to keep this site ad free~

  4. Back To Top    #4

    Join Date
    Jul 2013
    Location
    Oklahoma City
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    Re: GEting pool chemistry balanced

    Thanks both.

    I'll order the K2006 test kit tonight, do some reading up on this forum, and then I'll report back.
    Pool size in gallons - 13,640
    Filter type - Pentair Sand
    In ground
    Plaster/pebble, approx 33ft x 11ft
    Hayward SP2607X10 Super Pump 1-HP Max-Rated Single-Speed
    Age - not sure, most likely ~20 years

  5. Back To Top    #5
    linen's Avatar
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    Twin Cities, MN
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    Re: GEting pool chemistry balanced

    Welcome to tfp, fishface

    I agree with Smy and Isaac, you are flying blind with those strips. I doubt this is the case, since apparently a lot of cya has been put in the pool, but wouldn't it stink if they were wrong about the cya level (they often are) and you really didn't need to do any drain/refill. Here is the link to the pool school article on test kits: http://www.troublefreepool.com/pool-...kit_comparison Many of us have the tf-100 since it really is the best value and Dave (username duraleigh) has very fast shipping.
    TFP Expert who uses Pool School and my TF100 test kit along with PoolMath for my: Round 11K gallon AGP with deep end, 20" sand filter, Matrix 1hp 2spd, 6 2ftX20ft solar panels (and solar cover!), Intex SWCG (copper bars disconnected) and a Rubadub hot tub (chlorine). The SLAM process is not finished until: 1. CC < 0.5 ppm, 2. An OCLT < 1.0 ppm and, 3. The water is crystal clear.

  6. Back To Top    #6

    Join Date
    Jun 2012
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    Howell, NJ
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    977

    Re: GEting pool chemistry balanced

    [EDIT] I see you are going to order the test kit, so you can ignore that part[/EDIT]
    pH is going down because the tablets and "shock" are acidic, and quickly lower the pH. You should get the TF-100 or K-2006 which is linked to in my signature. When you get it, do the CYA test with 50% pool water and 50% tap water and double the result, so you can get a better idea of where your CYA is at. If it really is in the 100-150 range, you will want to do a partial drain to lower it. It is possible to maintain a pool with high CYA, but if you let anything slip, you will be using a LOT of bleach to clear it up.
    John
    7 year old ~13,500 gal 24' AGP with 1.5 hp Proline pump, 150 sqft Pleatco cartridge, filled with well water with pH of about 4.5.
    Wanda the Whale pool vacuum, home made heater, Taylor K-2006
    Cloudy Pool? 1) Order test kit. 2) Follow SLAM
    New to TFPC? Read Pool School a few times, then post questions. PoolMath will help with chemical additions.

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