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Thread: Newbie with an inground pool

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    Newbie with an inground pool

    Hi guys,
    I need some help. I have had my pool for about 3 years and last year it was great. Clear water all year .....just kept up with my PH and Alk and shocked it and kept tabs in the skimmer.
    Well I opened it this year and started reading this site and I am freaked out by CYA!!
    I have a 18x38 vinly liner pool 9.5 deep end. I have 4 cartridge filters (brand new this last month). I just tested my water with a commercial kit and got these readings:

    CYA 100+
    FC 1.2
    TC 7.5
    CC 6.3
    PH 7.2

    After doing some research I hear about this "best guess" chart....

    my question is this....CW seems to dictate that I drain the pool but running this best guess chart seems pretty tempting........pros/cons??
    Thanks for all your help
    WAZOO
    18 x 38 (9.5 ft deep end) , vinyl liner, chlorine pool, 4 cyclinder cartridge filter
    Northwest Tennessee

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    borjis's Avatar
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    Re: Newbie with an inground pool

    Which commercial test kit do you have?

    Is it based on drops / liquid or test strips?

    "Guess Strips" won't give accurate readings. We recommend the Taylor K2006C or TF100, if you have either of these you're set.

    Try to figure out your true cya level by mixing half n half pool water and tap water, then do the CYA test again with your back
    to full sun holding the test tube at waist level, shaded by your body, then divide that number by 2.

    I can say for a fact your FC of 1.2 isn't going to cut it.

    It might be a good idea to get it near 12 at the very least for now, but proper testing with a recommended test kit should be
    the first priority to getting the chemistry back in order.
    16x32 IG Vinyl, 13,000 Gals. Hayward S-244T sand filter, SP2810X15 pump
    (1.5 HP motor) Raypak PR266AEN (266k btu) gas heater. TF-100 Test Kit.
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    Richard320's Avatar
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    Re: Newbie with an inground pool

    Welcome, Wazoo

    100+ CYA is pretty vague. Is it 120, or 200, or even higher? When I took over, my CYA was somewhere in the 220-240 range. When you're diluting that much, small errors tend to magnify, so who knows?

    So if you leave the CYA alone, and it's 240, your minimum FC is 18, and the target is about 20. Oops. The pH reagent reacts with high FC and gives falsely high readings. Pictures. You'll never really be sure of the pH. pH out of range can cause eye and skin irritation and plaster damage.

    What if CYA is only 120? Minimum FC is 9... not too bad, you can test pH before you add the daily dose of bleach and keep it in line that way. But that's also a PITA, and it also means you must use the FAS-DPD tester every single day so that you know if you can test pH or not.

    And then if you get algae.... Shock level for 120 CYA is 47 The FAS-DPD test only reads as high as 50!

    If you're not under water restrictions, drain and replace some water. You'll be much happier in the long run.
    16K freeform gunite with spa; Pentair 4000 DE filter; Century Whisperflow 1 HP; Pentair Minimax heater.
    Troublefree does not mean Maintenancefree. It's like brushing your teeth: You can spend a couple minutes a day and pennies a week or go to the dentist once a year and spend several thousand dollars.
    A pool is like a pet - you have to feed it every day, even the days you don't want to play with it!

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    Texas Splash's Avatar
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    Re: Newbie with an inground pool

    Welcome to TFP!
    then divide that number by 2.
    I think borjis meant "multiply" your diluted mixture by two.
    Pat (a.k.a. Texas Splash) ~ My Pool: Viking Fiberglass; 17,888 Gal; Waterway Supreme 2-sp/2-hp pump; Hayward Ctg filter; TF-100 w/ Speed Stir
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    Re: Newbie with an inground pool

    DOH! Pat's right.
    16x32 IG Vinyl, 13,000 Gals. Hayward S-244T sand filter, SP2810X15 pump
    (1.5 HP motor) Raypak PR266AEN (266k btu) gas heater. TF-100 Test Kit.
    Dolphin E10 Cleaning Robot.

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    Re: Newbie with an inground pool

    Taylor Service Complete (high)...it uses drops K2005c

    What do you mean my FC is not going to cut it? Does that mean I need to add more?

    - - - Updated - - -

    Thanks Richard320!
    From reading on this site it appears I need to drain about 2/3 of my water. I will be replacing with well water. Once I have done that should I just refill and start testing again. I guess I am little confused (newbie!) - I was always under the impression that if the water is crystal clear that is all you needed.....I guess I got that wrong?
    WAZOO
    18 x 38 (9.5 ft deep end) , vinyl liner, chlorine pool, 4 cyclinder cartridge filter
    Northwest Tennessee

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    Richard320's Avatar
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    Re: Newbie with an inground pool

    Quote Originally Posted by wazoo View Post
    Taylor Service Complete (high)...it uses drops K2005c

    What do you mean my FC is not going to cut it? Does that mean I need to add more?

    - - - Updated - - -

    Thanks Richard320!
    From reading on this site it appears I need to drain about 2/3 of my water. I will be replacing with well water. Once I have done that should I just refill and start testing again. I guess I am little confused (newbie!) - I was always under the impression that if the water is crystal clear that is all you needed.....I guess I got that wrong?
    Crystal clear is great. That means no algae. That doesn't mean no bacteria or viruses or unoxidized snot or fecal matter. That's the sanitizing part of bleach. That's why it has to be a certain percentage of the CYA to be effective. You can easily manage a pool at 60 or 70 CYA, so you probably only need to replace half the water.
    16K freeform gunite with spa; Pentair 4000 DE filter; Century Whisperflow 1 HP; Pentair Minimax heater.
    Troublefree does not mean Maintenancefree. It's like brushing your teeth: You can spend a couple minutes a day and pennies a week or go to the dentist once a year and spend several thousand dollars.
    A pool is like a pet - you have to feed it every day, even the days you don't want to play with it!

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    Re: Newbie with an inground pool

    Thanks Richard320 - I plan to drain water over the next few days. So after I refill - do I just start over again testing PH and ALk?
    WAZOO
    18 x 38 (9.5 ft deep end) , vinyl liner, chlorine pool, 4 cyclinder cartridge filter
    Northwest Tennessee

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    Richard320's Avatar
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    Re: Newbie with an inground pool

    Quote Originally Posted by wazoo View Post
    Thanks Richard320 - I plan to drain water over the next few days. So after I refill - do I just start over again testing PH and ALk?
    Yep. Let the water mix and retest everything and go from there.
    16K freeform gunite with spa; Pentair 4000 DE filter; Century Whisperflow 1 HP; Pentair Minimax heater.
    Troublefree does not mean Maintenancefree. It's like brushing your teeth: You can spend a couple minutes a day and pennies a week or go to the dentist once a year and spend several thousand dollars.
    A pool is like a pet - you have to feed it every day, even the days you don't want to play with it!

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    Re: Newbie with an inground pool

    Experts, would it be a good idea for him to test his well water for metals prior to putting a bunch of well water in the pool?
    8,500gal plaster in-ground with attached spa, two floor drains, one skimmer. Chlorine, City Water.
    Pentair WhisperFlo 1hp Pump, MagnaTek Midcentury EPlus motor, Pentair CleanNClear 200SF Cartridge filter, Purex Triton MiniMax 250 Gas Heater, Pentair SunLite, AutoFill.
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    Re: Newbie with an inground pool

    Got her filled back up and just tested again:

    TA is 80ppm as Calcium carbonate - that is within tolerances rights?
    But PH is not even registering on the scale and there is no chlorine at all either

    Sooooo....since TA is good then I should just begin to raise PH right?
    WAZOO
    18 x 38 (9.5 ft deep end) , vinyl liner, chlorine pool, 4 cyclinder cartridge filter
    Northwest Tennessee

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    Texas Splash's Avatar
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    Re: Newbie with an inground pool

    A TA of 80 is fine for now. Extremely low pH not good. Definitely raise that right away. So what are your other readings (FC, CC, CYA)?
    Pat (a.k.a. Texas Splash) ~ My Pool: Viking Fiberglass; 17,888 Gal; Waterway Supreme 2-sp/2-hp pump; Hayward Ctg filter; TF-100 w/ Speed Stir
    Vital Links: POOL SCHOOL, RECOMMENDED LEVELS, RECOMMENDED CHEMICALS, Poolmath Calculator, SLAM, Chlorine/CYA CHART.
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    Re: Newbie with an inground pool

    Chlorine is zero..... I am out of the chemical to test for CYA (should be here tomorrow) so I do not have that reading
    WAZOO
    18 x 38 (9.5 ft deep end) , vinyl liner, chlorine pool, 4 cyclinder cartridge filter
    Northwest Tennessee

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    Texas Splash's Avatar
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    Re: Newbie with an inground pool

    It would be in your best interest to add some chlorine right away to prevent starting an algae bloom. At least add about 1/2 gallon of regular 8.25% bleach and let it mix real well. Check at least once a day. Until you can test your CYA we have no way of knowing what your true "target" FC level should be. If you receive it tomorrow, go to the link below in my signature "Chlorine/CYA Chart" to find your matching FC/CYA levels.
    Pat (a.k.a. Texas Splash) ~ My Pool: Viking Fiberglass; 17,888 Gal; Waterway Supreme 2-sp/2-hp pump; Hayward Ctg filter; TF-100 w/ Speed Stir
    Vital Links: POOL SCHOOL, RECOMMENDED LEVELS, RECOMMENDED CHEMICALS, Poolmath Calculator, SLAM, Chlorine/CYA CHART.
    If you enjoyed your TFP experience, please consider donating to Support TFP!

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    Re: Newbie with an inground pool

    New test with new Taylor Kit.......
    PH - 7.2
    AL - 80ppm
    FC 1.0
    CC 0.6
    CYA - 35


    I know that chlorine is low but I am putting in tabs ......I have three in now.. should I just keep adding chlorine until I get it up?
    WAZOO
    18 x 38 (9.5 ft deep end) , vinyl liner, chlorine pool, 4 cyclinder cartridge filter
    Northwest Tennessee

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    Texas Splash's Avatar
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    Re: Newbie with an inground pool

    I would. Actually I would recommend just using regular bleach - generic is fine to maintain your FC each day. Save the tabs for times away like on vacation or something, but not everyday use. If you use the tabs again, they will raise your CYA each week and before you know it your CYA could be high again. Plus, tabs are acidic so they lower pH and TA as well. Your pH is already low, so be careful about that as well if you continue to use pucks for a while.
    Pat (a.k.a. Texas Splash) ~ My Pool: Viking Fiberglass; 17,888 Gal; Waterway Supreme 2-sp/2-hp pump; Hayward Ctg filter; TF-100 w/ Speed Stir
    Vital Links: POOL SCHOOL, RECOMMENDED LEVELS, RECOMMENDED CHEMICALS, Poolmath Calculator, SLAM, Chlorine/CYA CHART.
    If you enjoyed your TFP experience, please consider donating to Support TFP!

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