Become a TFP Supporter Pool Math Forum Rules Pool School
Results 1 to 7 of 7

Thread: What shock product?

  1. Back To Top    #1

    Join Date
    Jun 2015
    Location
    spring hill fl
    Posts
    22

    What shock product?

    FC is a 6.5
    CC is .4
    PH is 7.6
    CH is 200
    CYA 35 (lots of rain)
    TA 100
    temp 90

    im looking to lower the CC to 0
    ===================
    13,500 gallon in-ground Salt water pool
    exposed aggregate pool finish
    pentair IC40
    pentair VS pump

  2. Back To Top    #2
    Mod Squad JVTrain's Avatar
    Join Date
    Feb 2014
    Location
    Central Minnesota
    Posts
    5,079

    Re: What shock product?

    CC of 0.5 or less is acceptable but if you want to try to drive it down, bring your FC up to 10 ppm using bleach to see if that eliminates the CC. Liquid shock/bleach will only raise your FC. Your CYA is very low for Florida and a salt water chlorine generator. Have you considered raising your CYA level to help reduce chlorine loss to sunlight?
    Joel - TFP Moderator - Minnesota - **Become a TFP Supporter!** Helpful Links: ABCs of Pool Water Chemistry - SLAM Procedure - Chlorine/CYA Chart
    40x20 Pool: 32K Gallons * Vinyl * Bleach Chlorination * Hayward S270T Sand Filter * Pentair SuperFlo 1 HP * Teledyne/Laars Heater * AquaVac Tigershark * TF-100 w/ SpeedStir
    Isolated Spa - 345 Gallons

  3. Back To Top    #3

    Join Date
    Jun 2015
    Location
    spring hill fl
    Posts
    22

    Re: What shock product?

    my first time testing the CYA. i was surprised at the result. before i had water tested at pool store. the results were around 70. think its possible to loose that much to a weeks worth of rain?
    ===================
    13,500 gallon in-ground Salt water pool
    exposed aggregate pool finish
    pentair IC40
    pentair VS pump

  4. Back To Top    #4

    In the Industry

    duraleigh's Avatar
    Join Date
    Apr 2007
    Location
    Sebring, Florida
    Posts
    30,077

    Re: What shock product?

    Lowering your CC's to zero is a waste of time. ,5 ppm CC's or less is treated as zero for our purposes.

    Not sure about the dilution on CYA but I am darn sure the pool store can be wrong by that much.....happens constantly.
    Dave S.
    42k vinyl and concrete pool, 1.5hp pump, 140gpm filter
    TFTestkits , PoolMath , Pool School

  5. Back To Top    #5
    Mod Squad JVTrain's Avatar
    Join Date
    Feb 2014
    Location
    Central Minnesota
    Posts
    5,079

    Re: What shock product?

    No. I do not. Reducing of 50% of your CYA would require replacing 50% of your water WITHOUT any mixing. If it was rain, you were very slightly diluting the CYA, then draining some off by backwashing. Pool stores are typically very bad at testing for CYA. Your result I would trust. To get more comfortable with your own test, make sure that you fill the tube and observe the result. Then pour the solution back into the dispenser bottle and fill the tube again. See if your observing a consistent number. You can do this multiple times with the same sample. It's also important to perform the test in full sun, with the sun behind you, holding the tube at about waist height, looking down into the tube.
    Joel - TFP Moderator - Minnesota - **Become a TFP Supporter!** Helpful Links: ABCs of Pool Water Chemistry - SLAM Procedure - Chlorine/CYA Chart
    40x20 Pool: 32K Gallons * Vinyl * Bleach Chlorination * Hayward S270T Sand Filter * Pentair SuperFlo 1 HP * Teledyne/Laars Heater * AquaVac Tigershark * TF-100 w/ SpeedStir
    Isolated Spa - 345 Gallons

  6. Back To Top    #6

    Join Date
    Jun 2015
    Location
    spring hill fl
    Posts
    22

    Re: What shock product?

    sounds good. i will leave the cc where it is.
    i will also retest the CYA in a few days and post the result
    Last edited by thomBPool; 07-20-2015 at 02:06 PM. Reason: more info needed
    ===================
    13,500 gallon in-ground Salt water pool
    exposed aggregate pool finish
    pentair IC40
    pentair VS pump

  7. Back To Top    #7

    Join Date
    Jan 2014
    Location
    Buckeye AZ
    Posts
    807

    Re: What shock product?

    I think it's probably reasonable to give your pool an extra bit of FC before/after rain storms. Lots of folks recently are maintaining fine til a storm starts a bloom. I shoot for a target 2 or 3 ppm higher than normal the night before a storm is rolling in.
    10,500 gal IG, Topaz Pebble, auto-level
    Hayward DE filter, 2HP Ecostar VSP, ProLogic PS-4, GVA actuators
    Cal Pools Wave Force Plus (wall return jets plus 2 floor pop-ups), Venturi Skimmer
    Water sheer, 2 wok pots, bubbler stem on the baja step
    ColorLogic Mutlicolor LED lamp. Taylor 2006+speed stir

Posting Permissions

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