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Thread: Not Sure

  1. Back To Top    #1

    Join Date
    Oct 2009
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    SW IN
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    Not Sure

    I have 25000 gal IG Foxx pool. I had a new liner installed mid april. At the same time I replaced the sand in the filter. Since start up I have been using the BBB method. I usually add 2 to 3 gts of 10% chlorine each day. I use Taylors FAS test kit to check FC and CC. The chlorine usually reads the same in the morning as the night before. I take the FC to 5 each night and by the next evening I am somewhere between 1.5 and 2. Over the last few days I have noticed the FC drops to 1 or less by noon. The CC has always read 0. I brush the pool at least 3 times a week. I daily brush the areas around the returns when I add chemicals.
    A week ago I noticed the returns seem to have reduced pressure. I checked the pressure gauge on the filter and noticed it was a bit high. I decided to backwash and wash shocked at the color. The sight glass showed a dark greenish grey color. I backwashed till the glass was clear.
    I talked to the pool store last monday and found a possible reason. When they were pumping the water out of my pool, which was almost black with slime, their pump burnt up. They finished pumping the water using my pump, supposedly on bypass. I now wonder if I have an algae prob.
    The water is crystal clear. I see no signs of algae. There is a bit of sand on the floor but that is from the grandkids using the pool. I am able to vacuum it easily. I does not disperse like algae always does when I brush it.
    I brought the FC up to 5 at 11:00 last night. I checked it again at 1:00 this morning. Still at 5. At 8:00 the FC was at 3 and CC at 0.
    Here are my latest test results.

    FC 3
    CC 0
    PH 7.8
    Alk 110
    Hardness 200
    TDS 260
    CYA 30

    Is it time to shock? According to the pool calculator I need to take the FC to 11 and keep it there. Do I need to add an algecide. Without seeing any algae, I'm not sure which one to get.
    I also have a hard time keeping the PH below 7.8 or 8.0. I have added acid 3 times in the last month. The PH drops to 7.4 and gradually rises to the current level over 3 to 4 days. I have my jets pointed up to improve circulation. The water is swirling at a pretty good rate but there are no bubbles.
    Sorry for all the questions but could sure use some advice.
    25k-30k gallon IG plaster/shotcrete
    Pentair 1 HP Hydropump
    C-9419 catridge filter
    Kreepy Krauly attack monster
    And ooooo, a diving board - WHO WANTS TO TOUCH ME? :)

  2. Back To Top    #2

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    Re: Not Sure

    I can help with your shock question
    The water is crystal clear.
    Add to that that you have no CC's and shocking would seem unneccesary.

    However, you have been letting your FC get just a little to low (keep it between 3-5ppm).

    Perform the overnight FC loss test to confirm you don't have anything growing in your pool. Instructions on how to do it are found in Pool School.
    Dave S. - Forum owner
    42k vinyl and concrete pool, 1.5hp pump, 140gpm filter
    TFTestkits , PoolMath , Pool School

  3. Back To Top    #3
    Butterfly's Avatar
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    Re: Not Sure

    Quote Originally Posted by gotgone
    I brought the FC up to 5 at 11:00 last night. I checked it again at 1:00 this morning. Still at 5. At 8:00 the FC was at 3 and CC at 0.
    At the 8:00 AM test, had the sun already hit your pool?

    Here are my latest test results.
    FC 3
    CC 0
    PH 7.8
    Alk 110
    Hardness 200
    TDS 260
    CYA 30

    Is it time to shock? According to the pool calculator I need to take the FC to 11 and keep it there. Do I need to add an algecide. Without seeing any algae, I'm not sure which one to get.
    I also have a hard time keeping the PH below 7.8 or 8.0. I have added acid 3 times in the last month. The PH drops to 7.4 and gradually rises to the current level over 3 to 4 days.
    It is not unusual for many of us to add acid weekly. You might want to drop pH to 7.2 instead of 7.4.

    I have my jets pointed up to improve circulation. The water is swirling at a pretty good rate but there are no bubbles.
    Having the jets pointed up and breaking the surface will aerate which will increase the rise in pH.

    Sorry for all the questions but could sure use some advice.
    Folks here are happy to answer questions and give opinions
    TFP Moderator TF100 Test Kit TF100 TestKit YouTube Channel PoolMath
    You're done SLAMing when:
    1)You lose 1ppm or less FC overnight, & 2)You have .5ppm CC's or less, & 3)your water is clear.

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  4. Back To Top    #4

    Join Date
    Oct 2009
    Location
    SW IN
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    Re: Not Sure

    I did the overnight test. At 11:00pm last night, the FC was between 5.5 and 6. CC was 0. At 5:45 this morning the FC was 4.5 and CC was 0. The sun was up but not yet on the pool. Any thoughts? Thanks again for your help.
    25k-30k gallon IG plaster/shotcrete
    Pentair 1 HP Hydropump
    C-9419 catridge filter
    Kreepy Krauly attack monster
    And ooooo, a diving board - WHO WANTS TO TOUCH ME? :)

  5. Back To Top    #5

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    Re: Not Sure

    Any thoughts?
    Yes. I think you are ready to go swimming and enjoy your pool. Nice work!
    Dave S. - Forum owner
    42k vinyl and concrete pool, 1.5hp pump, 140gpm filter
    TFTestkits , PoolMath , Pool School

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    Mod Squad Bama Rambler's Avatar
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    Re: Not Sure

    Just for grins, I'd do the overnight loss test again tonight. Try to get the evening test a little after dark and the morning test a little before daylight.
    Dave J. TFP Moderator
    24' x 52" Round AGP. 2hp/¼hp SPL Power-Flo 2-speed pump. 200sqft Waterway Cartridge Filter. 45MHP2(3GPD) Stenner Peristaltic Pump
    Pool School ----- Pool Math ----- TF-Test Kit

  7. Back To Top    #7

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    Oct 2009
    Location
    SW IN
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    Re: Not Sure

    The FC was at 1.0 when I got home at 7:45 tonight. I added 2 gal of 6%. I thoroughly brushed the pool after the addition. I will try again tonight. Thanks for the help
    25k-30k gallon IG plaster/shotcrete
    Pentair 1 HP Hydropump
    C-9419 catridge filter
    Kreepy Krauly attack monster
    And ooooo, a diving board - WHO WANTS TO TOUCH ME? :)

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