Become a TFP Supporter Pool Math Forum Rules Pool School
Results 1 to 8 of 8

Thread: FC Testing Question

  1. Back To Top    #1

    Join Date
    Jul 2015
    Location
    Tampa, FL
    Posts
    18

    FC Testing Question

    Greetings all. So Idecided that I wanted to start taking care of my 10,000 gallon pool, and after acouple of weeks of reading (and some experimenting), I think I am starting tounderstand some of the basics. Thatsaid, my pool has relatively high CYA levels (90) - probably reflective of tabletuse and the fact it hasnít been drained in at least the last 3 years - andafter doing some reading around the forum it looks like I need to keep mytarget FC around 10 and my shock FC around 35.
    So, last week I purchased Total Poolcare DPD Test Kit (Mfg.by Taylor) at Leslieís, and realized after getting it home that the CL/BR scaleonly goes to 5/10. That said, I also havea bottle of Clorox Smart Strips that measure FC up to 10 PPM, but Iíd like tobe able to get a better sense of where Iím at daily than the test stripsprovide; also the strips wonít help me to figure out where I am relative toshock values. So, I was wondering ifanyone might have some ideas on testing above 10 PPM.
    FC 10
    PH 7.5
    TA 100
    CH 400
    CYA 90
    Thanks in advance!

    Wade


  2. Back To Top    #2
    Mod Squad zea3's Avatar
    Join Date
    Jul 2009
    Location
    Houston, Texas
    Posts
    9,200

    Re: FC Testing Question

    Hi, welcome to TFP! What you need is the FAS/DPD test to measure chlorine > 10ppm. Your local stores probably do not have this test but you can order it from TF Testkits .

    You also may want to consider a partial drain and refill to lower your CYA.
    TFP Moderator
    Helpful links: TF Test Kits,TFP Pool School, PoolMath
    Vogue 21' round AG, Pentair 1 hp 2 speed pump, 36 sq ft DE filter, Hayward S180T 150# sand filter, Houston, Texas
    Love TFP? Become a
    TFP Supporter!

  3. Back To Top    #3

    Join Date
    Jul 2015
    Location
    Tampa, FL
    Posts
    18

    Re: FC Testing Question

    Thanks very much zea3, the TF-100 in the link you sent looks like it will do exactly what I need. I've been thinking about doing a few 10% drains - right now the water table around here is really high and I am nervous about draining too much - and I'm hoping that combined with the evaporation will help me get the number down during this season. I need to repaint this winter so I will be doing a full drain then, and hopefully that will drop it down to a more manageable level. Thanks again!

  4. Back To Top    #4

    Join Date
    Sep 2013
    Location
    Connecticut
    Posts
    728

    Re: FC Testing Question

    It sounds like you may just need the FAS/DPD test reagents, not the entire TF-100 (since the Taylor kit you already bought covers the other frequently measured parameters). If you browse around the tftestkits site, you will find a set of refillls specifically for the FAS/DPD test. You may also want to look at how much CYA reagent you have in your kit, and perhaps order a refill of that at the same time -- if you do a couple of partial drain and refills, you'll want to measure CYA a few times along the way.
    18' x 48" ring top pool (Summer Escapes); 5500 gallons; set up June - October, stored during winter; Intex 2500 gph pump (B size cartridge filter) Hayward 21" sand filter + 1.5 hp single speed Powerflo Matrix pump (upgrade October 2016) *** K-2006 test kit, refills from tftestkits

  5. Back To Top    #5

    Join Date
    Jul 2015
    Location
    Tampa, FL
    Posts
    18

    Re: FC Testing Question

    Good points all singingpond, will no doubt save me some "waiting on the UPS truck" time. Thanks
    10,000 Gallon Pebble Tec
    Hayward Star-Clear Plus C900 cartridge filter
    Hayward 1.5 HP pump
    Pool is filled from city water

  6. Back To Top    #6

    Join Date
    Sep 2013
    Location
    Connecticut
    Posts
    728

    Re: FC Testing Question

    Take a look here
    TFTestkits.net

    If you are getting FAS-DPD test materials separately, you will need all three chemicals shown - 0870, 0871, and 0003 (the latter is necessary for testing combined chlorine levels).
    18' x 48" ring top pool (Summer Escapes); 5500 gallons; set up June - October, stored during winter; Intex 2500 gph pump (B size cartridge filter) Hayward 21" sand filter + 1.5 hp single speed Powerflo Matrix pump (upgrade October 2016) *** K-2006 test kit, refills from tftestkits

  7. Back To Top    #7

    Join Date
    Aug 2012
    Location
    Ellington, CT
    Posts
    243

    Re: FC Testing Question

    Quote Originally Posted by Wade C View Post
    Thanks very much zea3, the TF-100 in the link you sent looks like it will do exactly what I need. I've been thinking about doing a few 10% drains - right now the water table around here is really high and I am nervous about draining too much - and I'm hoping that combined with the evaporation will help me get the number down during this season. I need to repaint this winter so I will be doing a full drain then, and hopefully that will drop it down to a more manageable level. Thanks again!
    If you don't have to SLAM your pool, then a cya of 90 ppm is manageable until you do drain for the repaint. Your cya is only going to go down from there (assuming your not using stabilized chlorine) by splash out and back-washing. Note that evaporation does not lower cya. With a cya of 90, you of course ,have to be able to measure FC above 5 ppm
    30,000 gal, 20 x 40 ft vinyl, IG, installed 2006
    1 HP WhisperFlo pump, 60 sqft Pentair Quad D.E., Liquidator(8 gallon) with 3/8 upgrade,TigerShark cleaning robot
    TFTestkits TF-100 with SpeedStir,WS
    A proud practitioner of TFP since 2013

  8. Back To Top    #8

    Join Date
    Jul 2015
    Location
    Tampa, FL
    Posts
    18

    Re: FC Testing Question

    Thanks to all for the replies and recommendations! I received my shiny new TF-100 yesterday, and will hopefully use it to support a SLAM this weekend. I will probably do the 10% drains/refills as discussed to get the CYA down...this pool "balancing" is just a little fun
    10,000 Gallon Pebble Tec
    Hayward Star-Clear Plus C900 cartridge filter
    Hayward 1.5 HP pump
    Pool is filled from city water

Posting Permissions

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