Become a TFP Supporter Pool Math Forum Rules Pool School
Results 1 to 5 of 5

Thread: New User

  1. Back To Top    #1

    Join Date
    Aug 2015
    Location
    Bethpage
    Posts
    9

    New User

    My pool store indicates chemical levels are normal, yet pool is turquoise. I purchased a Taylor K-2006 test kit with the following results. Free Chlorine 3.0, Combined Chlorine .2, PH 7.4, Alkalinity 90, CYA 100, Calcium 100. I have a sand filter where I replaced the sand, and have had it running for 4 straight days. The pool started the season crystal clear, then suddenly turquoise. Any Help or Suggestions are appreciated.
    Type: Above Ground , Liner: Vinyl , Size: 15'x30' oval , Capacity: 10,500 gallons (approx.)

    Filter: Sand , Valve: 6 Position Multiport, Pump: 1 1/2 HP, Inline Chlorine Dispenser

  2. Back To Top    #2

    TFP Guide

    Join Date
    Jun 2012
    Location
    western NY
    Posts
    1,557

    Re: New User

    I am sure our resident chemists will be along shortly, but I am thinking the CYA may be a bit high. Meanwhile you could click on the Pool School link at the top of the page and read up on the relationship of CYA to chlorine to get a better understanding of what needs to be adjusted.
    Unknown make 18' above ground (bought used in 1999) Sparco sand filter. Hayward 100,000 BTu heater. 2 speed pump

  3. Back To Top    #3

    In the Industry

    duraleigh's Avatar
    Join Date
    Apr 2007
    Location
    Sebring, Florida
    Posts
    30,084

    Re: New User

    Welcome to the forum.

    With a CYA of 100, your chlorine has been rendered pretty ineffective, allowing algae to grow in your pool.

    The correct way to fix that is to drain 50% of your pool so your 100 CYA reading then becomes 50 (although your CYA may be higher than 100) and your pool will be manageable again. The SLAM process is next and your pool will be ready and crystal clear the rest of the season.
    Dave S.
    42k vinyl and concrete pool, 1.5hp pump, 140gpm filter
    TFTestkits , PoolMath , Pool School

  4. Back To Top    #4

    Join Date
    Aug 2015
    Location
    Bethpage
    Posts
    9

    Re: New User

    Thank you, I've started the draining and will continue with your recommendations.
    Type: Above Ground , Liner: Vinyl , Size: 15'x30' oval , Capacity: 10,500 gallons (approx.)

    Filter: Sand , Valve: 6 Position Multiport, Pump: 1 1/2 HP, Inline Chlorine Dispenser

  5. Back To Top    #5

    Join Date
    May 2012
    Location
    Montville NJ
    Posts
    545

    Re: New User

    I am copying and pasting this from an other thread I replied to. Partial draining and re-filling is going to fix your high CYA for now, but it will go back up again if you keep using solid forms of chlorine.



    To get a full understanding, re-read Pool School. However the key thing to understand is CYA and forms of chlorine.

    Your pool needs CYA - it slows chlorine loss, but it also makes chlorine less effective. 50 where you are is fine (a touch high IMO, but still OK). You do not want it to go higher, or else you will start having problems. CYA does not drop on it's own, the only way to lower it is too drain some water and add fresh.

    Now here comes the kicker - any kind of chlorine that you buy that comes in solid form - pucks, sticks, granules - either shock, tabs, clean and swim, or whatever else they call it, also contains CYA - that is just how it is. Using solid chlorine will raise your CYA.

    That is why we say to use bleach (or, if you have a source and are comfortable with it, liquid chlorine, which is in essence stronger bleach)
    27' Round ABG (17,000 gal) - +/- 11 hours of full sun per day
    Hard plumbed Hayward Perflex EC-40 DE filter w/ 1 HP pump (Got a new one June 2015)
    Filered 4 hours per day (on a timer)
    Pentair Aqualuminator - now working - and now dead once again, this time for good.
    Zodiac Wahoo

Posting Permissions

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