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Thread: Cloudy pool - test results

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    Cloudy pool - test results

    I opened my pool two weeks ago and the water was crystal clear until this past weekend. Algae started to takeover, so I brought the chlorine up to around 10. The pool turned green until about two days ago, now it appears to be slowly clearing up. I ordered the TF-100 kit and did my first test last night. Here are the results:

    FC 12.5
    CC .5
    TC 13
    pH 7.3
    T/A 130
    CYA > 100
    Temp 71 F

    I keep my Borates at around 50.

    Here is an image from this morning. I would appreciate any insight into my readings. I have family in town this weekend and although the pool looks better than it did earlier this week, I am frustrated! I have this problem every year, but usually not until July/August - when the water temp gets above 90.



    Thanks,
    Shannon
    Hello all from the land of smiles. Thailand. 5mx9mx1.5 63000L 16300 gall, pebbletex,
    pentair 1hp whisperflow, tagelus TA60 SF, swg monarch esc24 {a bit small for the tropics} 3 returns, 1 skimmer, 2 astral 100watt lights. Planned and built by me
    an AUSSIE expat living thailand for 18 years.

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    Hi, Shannon,

    Welcome. Your's is a common issue. YOu have too much CYA in your pool.

    As a result, you must keep your chlorine levels up very, very high to prevent algae. I would bring the chlorine up to 25ppm and HOLD IT THERE until your pool is completely clear.

    Then, because of that high CYA, you must keep your FC around the 10ppm level for the rest of the summer. If you do not, it will turn green again.

    The cure is to drain a good portion of your pool water to dilute the CYA.

    PS - You're close on getting it clean. If you'll get the chlorine up, I think another 24-48 hours and it'll be perfect.

    It's fine to swim in with high chlorine because the high CYA in your pool reduces the chlorines effectiveness.
    Dave S. - Forum owner
    42k vinyl and concrete pool, 1.5hp pump, 140gpm filter
    TFTestkits , PoolMath , Pool School

  3. Back To Top    #3

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    Thanks, Dave. I feel better now Do I need to bring FC or TC up?

    Shannon
    Attached Images Attached Images
    Hello all from the land of smiles. Thailand. 5mx9mx1.5 63000L 16300 gall, pebbletex,
    pentair 1hp whisperflow, tagelus TA60 SF, swg monarch esc24 {a bit small for the tropics} 3 returns, 1 skimmer, 2 astral 100watt lights. Planned and built by me
    an AUSSIE expat living thailand for 18 years.

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    IkeRay's Avatar
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    The "difference" between FC and TC is the CC (combine chlorimites). You want to raise FC, but you also want TC and FC to be as close as possible, a CC level (or TC-FC) of >1 typically means you need to shock.

    curious, what kind of chlorine are you using? also, specs on the pool (size, salt water generator?, filter type, you know the pool things)?
    30,000gal In-ground Gunite Pool DE filter
    Polaris 380 APC

    BBB method all the way - Newb, like to absorb info and chatter, but take the experts' advise

  5. Back To Top    #5

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    I am using just Wal-Mart brand liquid bleach (6%). The pool is 16.5 x 32.5 - 8 feet at the deep end - about 20,000 gallons (if I recall correctly). I am using a 22 Hayward sand filter, one hp Hayward pump, and an Ultra Pure Ozonator.

    I am getting ready to head out to add a few more gallons of bleach. Sounds like I need to drain about half the water out of my pool at the end of the season ? Thanks for the advice!
    Attached Images Attached Images
    Hello all from the land of smiles. Thailand. 5mx9mx1.5 63000L 16300 gall, pebbletex,
    pentair 1hp whisperflow, tagelus TA60 SF, swg monarch esc24 {a bit small for the tropics} 3 returns, 1 skimmer, 2 astral 100watt lights. Planned and built by me
    an AUSSIE expat living thailand for 18 years.

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    Guest
    looks like a nice pool though, and it also looks like your dolphin was just shot and he keeled over

  7. Back To Top    #7

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    Thanks, it is even nicer when you can see the bottom at the deep end. Regarding the Dolphin, I am letting him rest. He has been busy

    Quote Originally Posted by Rollin Thunder
    looks like a nice pool though, and it also looks like your dolphin was just shot and he keeled over
    Hello all from the land of smiles. Thailand. 5mx9mx1.5 63000L 16300 gall, pebbletex,
    pentair 1hp whisperflow, tagelus TA60 SF, swg monarch esc24 {a bit small for the tropics} 3 returns, 1 skimmer, 2 astral 100watt lights. Planned and built by me
    an AUSSIE expat living thailand for 18 years.

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    Shannon,

    In the clearing process you're going through, keep an eye on your pressure guage on the filter. If it goes up by 30% or more from normal, be sure to backwash (clean) to remove the dead algae.

    Another Carolinian! We're gaining on those Texans!!
    Dave S. - Forum owner
    42k vinyl and concrete pool, 1.5hp pump, 140gpm filter
    TFTestkits , PoolMath , Pool School

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    IkeRay's Avatar
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    Quote Originally Posted by shannonadams68
    I am using just Wal-Mart brand liquid bleach (6%). The pool is 16.5 x 32.5 - 8 feet at the deep end - about 20,000 gallons (if I recall correctly). I am using a 22 Hayward sand filter, one hp Hayward pump, and an Ultra Pure Ozonator.

    I am getting ready to head out to add a few more gallons of bleach. Sounds like I need to drain about half the water out of my pool at the end of the season ? Thanks for the advice!

    from a cost perspective, it might be more convenient to do the CYA drop now before the season seriously starts. call your MUD district or water source (city?), many will give significant discounts if you are filling a pool since you don't have to pay sewage.
    30,000gal In-ground Gunite Pool DE filter
    Polaris 380 APC

    BBB method all the way - Newb, like to absorb info and chatter, but take the experts' advise

  10. Back To Top    #10

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    Quote Originally Posted by shannonadams68
    I am using just Wal-Mart brand liquid bleach (6%). The pool is 16.5 x 32.5 - 8 feet at the deep end - about 20,000 gallons (if I recall correctly). I am using a 22 Hayward sand filter, one hp Hayward pump, and an Ultra Pure Ozonator.

    I am getting ready to head out to add a few more gallons of bleach. Sounds like I need to drain about half the water out of my pool at the end of the season ? Thanks for the advice!
    Do you have any idea how the Cyanuric Acid (CYA) level got to be so high? Was that a carryover from a previous season where Trichlor pucks/tabs were used or Dichlor for shocking or was too much Cyanuric Acid added directly at some point?

    The CYA level is probably pretty high -- probably 150 ppm or more -- since even the Borates and the ozonator weren't able to keep the algae at bay when the chlorine level was presumably lower. Anyway, I agree with the advice that it might be cheaper for you to deal with the partial drain/refill now, even if that just results in a CYA of 70-80 which would still be manageable keeping the chlorine around 7-8 ppm FC.

    You say you usually get algae every year in July/August. Hopefully, with the help of those on this forum, that won't happen this year.

    Richard
    16,000 gallon outdoor in-ground 16'x32' plaster pool; Pentair Intelliflo VF pump; Pentair IntelliTouch i9+3s control system; Jandy CL-340 square foot cartridge filter
    12 Fafco solar panels; Purex Triton PowerMax 250 natural gas heater (200,000 BTU/hr output); automatic electric pool safety cover; 4-wheel pressure-side "The Pool Cleaner"

  11. Back To Top    #11

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    Ok, two days later...here are the readings and how the pool looks. It is much better, but still a bit murky. I have added about three to four gallons of liquid bleach since Friday and probably should add a few more gallons?

    FC 15.5
    CC 0
    TC 15.5
    CYA > 100
    Temp 75



    Although I really dread it, it sounds like I need to drain a portion of my pool. I am going to hold off a bit for now, but will probably since start draining about 10% and refill every week or so starting next week.

    I used the 3" Tri-Chlor tablets for two and half seasons and switched to liquid bleach and high Borates in the middle of last Summer. So, that would explains the super high CYA. Any thoughts on the latest readings?

    Thanks to everyone!
    Hello all from the land of smiles. Thailand. 5mx9mx1.5 63000L 16300 gall, pebbletex,
    pentair 1hp whisperflow, tagelus TA60 SF, swg monarch esc24 {a bit small for the tropics} 3 returns, 1 skimmer, 2 astral 100watt lights. Planned and built by me
    an AUSSIE expat living thailand for 18 years.

  12. Back To Top    #12
    JasonLion's Avatar
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    It looks like you are doing well. Keep the FC above 15, as you have it now, and keep an eye on the filter pressure and backwash/clean the filter as needed and things should continue to improve.
    19K gal, vinyl, 1/2 HP WhisperFlo pump, 200 sqft cartridge filter, AutoPilot Digital SWG, Dolphin Dynamic cleaning robot
    Creator of PoolMath and Pool Calculator. Other handy links: Support this site, TF Test Kits, Pool School

  13. Back To Top    #13

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    I would think that if you drain about 10% a week, it would use more water to reach a desired CYA level than if you just drained 50% and got it over with. You can drain it using several garden hoses so long as you have some place lower in your yard than the midpoint of the pool, which it looks like it could be over next to the trampoline...
    steve

    Above Ground / 18' Round / Vinyl Liner / Sand Filter / 100K Gas Heater / Salt Added / No Nature2

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