Become a TFP Supporter Pool Math Forum Rules Pool School
Results 1 to 12 of 12

Thread: How to get the shock level number

  1. Back To Top    #1

    Join Date
    Jul 2012
    Location
    Central Ohio
    Posts
    7

    How to get the shock level number

    Yes, I'm brand new at pool maintenance.

    I've been studying this site for a few days now, and think I have an understanding of how to go about the shock process. My test kit including the CYA test capability is in transit, so I don't have those results yet. Though, The pool hasn't been treated for over a year. Lots of yard renovations.

    In doing my studying, I seem only confused as to how to get a shock-level reading using a test kit, when the test kit only reads up to 5? I'm sure it's a simple math adjustment. Fewer drops, more drops? Only I'm not sure how to make that adjustment. Nor with which chemical.

    Any recommendations are appreciated.

    FC - 5 immediately, fades to 3.5 by the time I add the 0003 drops
    CC 3 but fades quickly. This confuses me. Tested 3 times.
    pH - 7.2
    TA - 120 this result turns yelly instead of the red that is expected. ??
    CH - Unknown. Test kit in mail
    CYA - Unknown. Test kit in mail. May be 0. Though, I have 3" chlorine tablets with stabilizer in skimmer. I'm sure it's still low.

    Shock-level may require several gallons of chlorine shock a day 5-6, correct?

    Thanks!
    Spartan Pool 25k IG, Vinyl Liner, Hayward s200 Sand Filter, Hayward Super Pump 1HP

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

    Re: How to get the shock level number

    the FAS-DPD test does not have the 5ppm limit. You count drops to find the FC level up to 50ppm.

    Sounds like you just need to wait for your kit.

    You can try using a 50/50 mix of pool and distilled water with your test and then doubling the reading ... but it is not very accurate.

    Posted with Tapatalk ... sorry if I sound short ... hate typing on phone
    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
    Jul 2012
    Location
    Central Ohio
    Posts
    7

    Re: How to get the shock level number

    Thanks Jason. I've dumped 12 gallons of shock over the past few days (5 last night), and just can't seem to get the numbers up. I know that the CYA may be the culprit. However, I thought that it may be relatively low, since the pool hadn't been treated for over a year. How long does CYA linger if the pool is left untreated?

    Additionally, When testing the FC, Should the result color fade down the chart? Or will it hold steady for the accurate FC? I notice that as soon as I do the flip-to-mix, the FC can be up around 5,. However, it slowly fades down 2. It takes about 2 minutes to fade though.

    Thanks for you time!

    Jacob
    Spartan Pool 25k IG, Vinyl Liner, Hayward s200 Sand Filter, Hayward Super Pump 1HP

  4. Back To Top    #4
    JasonLion's Avatar
    Join Date
    May 2007
    Location
    Silver Spring, MD
    Posts
    37,879

    Re: How to get the shock level number

    That means your FC level is a bit over 10. The DPD chlorine test bleaches out when the FC level is high enough. When you are right near the threshold of bleaching out it can behave as you describe.
    19K gal, vinyl, 1/2 HP WhisperFlo pump, 200 sqft cartridge filter, AutoPilot Digital SWG, Dolphin Dynamic cleaning robot
    Creator of PoolMath and Pool Calculator. Other handy links: Support this site, TF Test Kits, Pool School

  5. Back To Top    #5

    Join Date
    Jul 2012
    Location
    Central Ohio
    Posts
    7

    Re: How to get the shock level number

    Once I get the FC to shock level, how often throughout the day can I expect to pour additional liquid shock to the pool? I have been adding 4 gallons at once, then just vaccuming, scrubbing, and backwashing. Should I be spreading those 4 gallons apart throughout the day?
    Spartan Pool 25k IG, Vinyl Liner, Hayward s200 Sand Filter, Hayward Super Pump 1HP

  6. Back To Top    #6

    Join Date
    Jun 2012
    Location
    NJ
    Posts
    50

    Re: How to get the shock level number

    How often you have to add will vary depending on how quickly your FC is being used up but will be more often in the beginning of the shock process than later on. Measure as often as you can and add bleach as needed to ensure your FC stays at shock levels (but not more than once per hour).

    When I went through it, I was adding additional bleach every 2-3 hours at first. You'll have to use the FAS-DPD test, though, to ensure you can accurately maintain appropriate shock levels in the pool until you pass the 3 criteria from Pool School: CC is 0.5 or lower, an overnight FC loss of 1.0 ppm or less, and clear water.
    24,000 gallon in-ground plaster, Pentair FNSP60 60 sq. ft. DE filter @ 9,000 GPH, 2HP WhisperFlo pump, CircuPool RJ45 SWG, 399k BTU Raypak heater, built 2008. Taylor K2006C kit.

  7. Back To Top    #7

    Join Date
    Jul 2012
    Location
    Central Ohio
    Posts
    7

    Re: How to get the shock level number

    Thanks Jason. I've got those target numbers on my pad of notes by the pool. New kit should be on my door-step when I get home today.

    Before I head to the store, though. Chlorine Shock can be used instead of the bleach, yes? I know from reading pool school that the liquid shock is at about 12% and Ultra Bleach from Wal Mart/Sam's is around 6%. So, my plans have me using the shock from the pool store.
    Spartan Pool 25k IG, Vinyl Liner, Hayward s200 Sand Filter, Hayward Super Pump 1HP

  8. Back To Top    #8

    Join Date
    Jun 2012
    Location
    NJ
    Posts
    50

    Re: How to get the shock level number

    Yep.. you can use either, just make sure that you're putting in the correct percentage in the Pool Calculator when determining how much to add.
    24,000 gallon in-ground plaster, Pentair FNSP60 60 sq. ft. DE filter @ 9,000 GPH, 2HP WhisperFlo pump, CircuPool RJ45 SWG, 399k BTU Raypak heater, built 2008. Taylor K2006C kit.

  9. Back To Top    #9

    Join Date
    Jul 2012
    Location
    Central Ohio
    Posts
    7

    Re: How to get the shock level number

    Thanks for your guidance Jason. I'll update you on the progress.
    Spartan Pool 25k IG, Vinyl Liner, Hayward s200 Sand Filter, Hayward Super Pump 1HP

  10. Back To Top    #10

    Join Date
    Jun 2012
    Location
    NJ
    Posts
    50

    Re: How to get the shock level number

    Just wanted to mention that I'm not Jason--just sharing what I've learned from Pool School! Sorry, Jason, not trying to steal your identity!
    24,000 gallon in-ground plaster, Pentair FNSP60 60 sq. ft. DE filter @ 9,000 GPH, 2HP WhisperFlo pump, CircuPool RJ45 SWG, 399k BTU Raypak heater, built 2008. Taylor K2006C kit.

  11. Back To Top    #11

    Join Date
    Jul 2012
    Location
    Central Ohio
    Posts
    7

    Re: How to get the shock level number

    My apologies! I assumed Jason was the only one replying. Embarrassed on my end. I'll pay close attention to who's replying from now on.

    A personal "Thank You", to you rtkane.

    And, Thanking "both" Jason's individually. Thank you. Thank you.
    Spartan Pool 25k IG, Vinyl Liner, Hayward s200 Sand Filter, Hayward Super Pump 1HP

  12. Back To Top    #12

    Join Date
    Jun 2012
    Location
    NJ
    Posts
    50

    Re: How to get the shock level number

    Oh, no worries! I just didn't want anyone to think it was Jason posting, that's all!
    24,000 gallon in-ground plaster, Pentair FNSP60 60 sq. ft. DE filter @ 9,000 GPH, 2HP WhisperFlo pump, CircuPool RJ45 SWG, 399k BTU Raypak heater, built 2008. Taylor K2006C kit.

Posting Permissions

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