Become a TFP Supporter Pool Math Forum Rules Pool School
Results 1 to 10 of 10

Thread: Water looks clear and sparkly, but...

  1. Back To Top    #1

    Join Date
    Jan 2014
    Location
    Harrisburg, NC
    Posts
    25

    Water looks clear and sparkly, but...

    Iíve been drawing water out of our pool and refilling, over the course of several sessions (never going completely empty to prevent pop out) in an attempt to get my CYA to a manageable level. Previous owner had been using the pucks for a decade or so and had never replaced water.

    Iím now down to about 60ppm CYA so Iím thinking I will stop here and try to balance and maintain. Overnight there was what I *think* was a little bit of algae sprouting along the vinyl seams, even though Iíve been circulating non-stop. I went out and swept it away with the pool brush, but it returned a few hours later. Iím thinking I need to do something urgently to prevent a swamp from forming as I havenít added any chemicals at all in the short time Iíve owned the pool.

    Here are my numbers:
    CYA = 60
    FC = 4.5
    CC = Not present
    pH = 7.4
    TA = 160 ppm
    CH = 120 ppm

    According to Pool Math, I need to add a little over half a gallon of bleach to my 16,000 gallon pool to get the FC where it should be. Any comments are welcome! Thanks for your feedback.
    2005 build, 16K gal, IG - vinyl, 3/4 hp WhisperFlo pump, sand filter, Polaris cleaning robot

  2. Back To Top    #2
    Mod Squad jblizzle's Avatar
    Join Date
    May 2010
    Location
    Tucson, AZ
    Posts
    37,389

    Re: Water looks clear and sparkly, but...

    IF you suspect algae starting you need to follow the SLAM Process until you pass the 3 criteria to stop ... which is going to require a lot more bleach that a half gallon.

    This also requires that you have the FAS-DPD chlorine test that is part of the Recommended Test Kits (if you do not have it already).
    Jason, TFP Moderator
    18k IG pebblesheen pool, Hayward ProLogic P4 w/ T-15 SWG, Pentair 1HP 2-speed Superflo, Hayward 6020 DE filter
    500 sqft Heliocol solar panels, ThePoolCleaner, TF-100 test kit w/ SpeedStir
    Pool School + Test Kit + PoolMath = A TROUBLE FREE POOL
    If you found TFP helpful and we saved you money ... Become a TFP Supporter!

  3. Back To Top    #3

    Join Date
    Jan 2014
    Location
    Harrisburg, NC
    Posts
    25

    Re: Water looks clear and sparkly, but...

    OK. I didn't have enough bleach on hand for a proper SLAM, but I added two gallons and will re-test tomorrow after 24hrs of circulation. Also brushed off the remaining algae again (it was only a small area) so we'll see if it returns.
    2005 build, 16K gal, IG - vinyl, 3/4 hp WhisperFlo pump, sand filter, Polaris cleaning robot

  4. Back To Top    #4
    pwrstrk's Avatar
    Join Date
    Aug 2012
    Location
    Elverson Pa.
    Posts
    4,758

    Re: Water looks clear and sparkly, but...

    Get yourself some more bleach. The longer you maintain SLAM level the quicker this will go for you.
    Jeff
    24'x54" AG Morada RTR (by wilbar) 13'500 gal. Hayward Powerflo Matrix 1hp 2 speed. Hayward Perflex EC65 DE filter.

  5. Back To Top    #5
    Mod Squad jblizzle's Avatar
    Join Date
    May 2010
    Location
    Tucson, AZ
    Posts
    37,389

    Re: Water looks clear and sparkly, but...

    Please read the process ... it is not a one time addition of chlorine. Ideally you are testing and adding bleach as required every hour or so to start, but at LEAST twice a day.
    Jason, TFP Moderator
    18k IG pebblesheen pool, Hayward ProLogic P4 w/ T-15 SWG, Pentair 1HP 2-speed Superflo, Hayward 6020 DE filter
    500 sqft Heliocol solar panels, ThePoolCleaner, TF-100 test kit w/ SpeedStir
    Pool School + Test Kit + PoolMath = A TROUBLE FREE POOL
    If you found TFP helpful and we saved you money ... Become a TFP Supporter!

  6. Back To Top    #6

    In the Industry

    duraleigh's Avatar
    Join Date
    Apr 2007
    Location
    Sebring, Florida
    Posts
    30,082

    Re: Water looks clear and sparkly, but...

    SLAMming the pool hurts nothing and only helps.

    That said, your test results would indicate your FC levels have been fluctuating a lot to allow algae to get a grip? If that's true, I would first try simply maintaining an FC around 10 ppm and CONSTANTLY REPLENISHING to hold FC at 10 for a few days and see if the algae is eliminated
    Dave S.
    42k vinyl and concrete pool, 1.5hp pump, 140gpm filter
    TFTestkits , PoolMath , Pool School

  7. Back To Top    #7

    Join Date
    Jan 2014
    Location
    Harrisburg, NC
    Posts
    25

    Re: Water looks clear and sparkly, but...

    Just an update...I held off on SLAMing because I was on the fence about draining again to get my CYA levels down just a little more. Basically, I didn't want all my bleach to go down the drain and also did not want to try to balance twice. Plus it is winter here and nobody is using the pool. I ended up replacing some water and that helped to get CYA where I am happy with it.

    Here are my new numbers:
    pH: 8.0
    TA: 140 ppm
    CH: 120 ppm
    CYA: 30 ppm
    FC: 4.5
    CC: 0

    What I think I should do first is balance the pH by adding muriatic acid and this should also have an effect on TA. From reading here, I should not worry about my CH number even though it isn't quite in the suggested range listed in the book from my test kit. After pH reads OK, then I can SLAM. Is this a good gameplan?
    2005 build, 16K gal, IG - vinyl, 3/4 hp WhisperFlo pump, sand filter, Polaris cleaning robot

  8. Back To Top    #8
    pwrstrk's Avatar
    Join Date
    Aug 2012
    Location
    Elverson Pa.
    Posts
    4,758

    Water looks clear and sparkly, but...

    Yes lower your PH into the low 7's if your going to SLAM. Needs to be lowered any how. Do you still have visible algae ? If your pool water is cold did you let your sample come to room temp before you did the CYA test. Sometimes cold water can affect the CYA test.
    Jeff
    24'x54" AG Morada RTR (by wilbar) 13'500 gal. Hayward Powerflo Matrix 1hp 2 speed. Hayward Perflex EC65 DE filter.

  9. Back To Top    #9

    Join Date
    Jan 2014
    Location
    Harrisburg, NC
    Posts
    25

    Re: Water looks clear and sparkly, but...

    I went to the pool store and they did not have muriatic acid (too dangerous?) so I got some sodium bisulfate to lower the pH instead. I didn't know about the cold impacting the CYA test...I will try it again at room temp.
    2005 build, 16K gal, IG - vinyl, 3/4 hp WhisperFlo pump, sand filter, Polaris cleaning robot

  10. Back To Top    #10
    pwrstrk's Avatar
    Join Date
    Aug 2012
    Location
    Elverson Pa.
    Posts
    4,758

    Water looks clear and sparkly, but...

    You can get the acid at HD, Lowe's.
    Jeff
    24'x54" AG Morada RTR (by wilbar) 13'500 gal. Hayward Powerflo Matrix 1hp 2 speed. Hayward Perflex EC65 DE filter.

Posting Permissions

  • You may not post new threads
  • You may not post replies
  • You may not post attachments
  • You may not edit your posts
  •