Become a TFP Supporter Pool Math Forum Rules Pool School
Page 1 of 2 12 LastLast
Results 1 to 20 of 26

Thread: How important is CYA when shocking, other questions, results

  1. Back To Top    #1

    Join Date
    Mar 2010
    Location
    Spring, TX
    Posts
    1,082

    How important is CYA when shocking, other questions, results

    I just tested for CYA and found I have zero. The black dot never disappeared. I failed the overnight test as well as I lost 2 ppm. This morning around 8 am I tested and it was at 10.5. I tested about 1215 and it was at 7. So a 3.5 PPM loss seems like a lot right now. So I am in the process of shocking and was wondering do I need to worry about CYA or not.

    Each time I test for CC I get 0.

    Here are the rest of my results which seems fine, with the exception of CH is a little low.

    These results are from around 2 am this morning

    FC-12.5
    CC-0
    TC-12.5
    TA-110
    CH-225
    CYA-0 as of 8 am this morning.

    Edit: Water is crystal clear. I did have an issue with my pump leaking at a seal and got that fixed this AM so not sure if that would hinder any of the results.

    Thanks.
    13,000 Plaster IG Pool approx
    Hayward C5030 Cart Filter
    Emerson 1081 EB653 1.0 HP 1.40 S.F. 3450 RPM
    Pool Calculator, Pool School, TF Test Kits

  2. Back To Top    #2
    Mod Squad zea3's Avatar
    Join Date
    Jul 2009
    Location
    Houston, Texas
    Posts
    9,198

    Re: How important is CYA when shocking, other questions, res

    Even though it is not summer yet, we are getting enough sun in the Houston area to burn off chlorine at a good clip. You need to go ahead and bump the CYA up to 30. If you want, you can use The Pool Calculator to see how much trichlor you can use to bring the CYA while you are in the shock process.
    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
    Mar 2010
    Location
    Spring, TX
    Posts
    1,082

    Re: How important is CYA when shocking, other questions, res

    Here are some pictures
    Attached Images Attached Images
    13,000 Plaster IG Pool approx
    Hayward C5030 Cart Filter
    Emerson 1081 EB653 1.0 HP 1.40 S.F. 3450 RPM
    Pool Calculator, Pool School, TF Test Kits

  4. Back To Top    #4

    Join Date
    Feb 2008
    Location
    Denton, TX
    Posts
    5,061

    Re: How important is CYA when shocking, other questions, res

    Agree with zea. Raise the CYA to 30 and use the shock level FC for a CYA of 30 to accomplish the task.

    Some CYA is needed to shock an outdoor pool as it is the only way to keep any FC in there for a period of time.

  5. Back To Top    #5

    Join Date
    Mar 2010
    Location
    Spring, TX
    Posts
    1,082

    Re: How important is CYA when shocking, other questions, res

    Quote Originally Posted by 257WbyMag
    Agree with zea. Raise the CYA to 30 and use the shock level FC for a CYA of 30 to accomplish the task.

    Some CYA is needed to shock an outdoor pool as it is the only way to keep any FC in there for a period of time.
    Thanks for the info. I just added 4 lbs of stablizer. It showed 60 oz by weight so this is only 4 ounces more so should be just fine.

    About how long will it take for the stablizer to show up on a test?

    thanks.
    13,000 Plaster IG Pool approx
    Hayward C5030 Cart Filter
    Emerson 1081 EB653 1.0 HP 1.40 S.F. 3450 RPM
    Pool Calculator, Pool School, TF Test Kits

  6. Back To Top    #6
    Mod Squad zea3's Avatar
    Join Date
    Jul 2009
    Location
    Houston, Texas
    Posts
    9,198

    Re: How important is CYA when shocking, other questions, res

    Give it about a week to show up. Dose your pool with the expected CYA level.
    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!

  7. Back To Top    #7

    Join Date
    Mar 2010
    Location
    Spring, TX
    Posts
    1,082

    Re: How important is CYA when shocking, other questions, res

    Quote Originally Posted by zea3
    Give it about a week to show up. Dose your pool with the expected CYA level.
    That is what I have done. I am consfused on how big my pool is. I am basing this off my FC test. I measure before I add bleach and then wait about 30 minutes after I add bleach and see what my number is. I thought I had a 22000 gallon pool based off of my measurments. But when I use my before and after FC number I get a pool that is a lot smaller.

    So I dont want to overshoot the CYA by adding too much.

    Also since I just added some CYA how shoudl I approach the overnight test? Keep doing it if I lose more than 1 ppm?

    Thanks.
    13,000 Plaster IG Pool approx
    Hayward C5030 Cart Filter
    Emerson 1081 EB653 1.0 HP 1.40 S.F. 3450 RPM
    Pool Calculator, Pool School, TF Test Kits

  8. Back To Top    #8
    JasonLion's Avatar
    Join Date
    May 2007
    Location
    Silver Spring, MD
    Posts
    37,879

    Re: How important is CYA when shocking, other questions, res

    You should continue shocking at least until you pass the overnight FC loss test. To pick your target FC level, assume that you have already reached your targeted CYA level based on how much CYA you added.
    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

  9. Back To Top    #9

    Join Date
    Mar 2010
    Location
    Spring, TX
    Posts
    1,082

    Re: How important is CYA when shocking, other questions, res

    Do I need to worry about CH at this time. I know it is low and would like to bump it up to 350 for the season. Is it too early to do this?

    Thanks.
    13,000 Plaster IG Pool approx
    Hayward C5030 Cart Filter
    Emerson 1081 EB653 1.0 HP 1.40 S.F. 3450 RPM
    Pool Calculator, Pool School, TF Test Kits

  10. Back To Top    #10

    Join Date
    Feb 2008
    Location
    Denton, TX
    Posts
    5,061

    Re: How important is CYA when shocking, other questions, res

    I don't see your CH as a pressing issue right now.

  11. Back To Top    #11
    JasonLion's Avatar
    Join Date
    May 2007
    Location
    Silver Spring, MD
    Posts
    37,879

    Re: How important is CYA when shocking, other questions, res

    You should leave any CH adjustments until shocking is over. The pool should be fine with the CH level it has for a couple of days. CH additions are sensitive to PH fluctuations possibly causing calcium clouding. Large PH fluctuations are very common during shocking.
    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

  12. Back To Top    #12

    Join Date
    Mar 2010
    Location
    Spring, TX
    Posts
    1,082

    Re: How important is CYA when shocking, other questions, res

    Quote Originally Posted by JasonLion
    You should leave any CH adjustments until shocking is over. The pool should be fine with the CH level it has for a couple of days. CH additions are sensitive to PH fluctuations possibly causing calcium clouding. Large PH fluctuations are very common during shocking.
    I know any FC level over 10 then pH is not have good test reliability. Do I need to worry about pH at this time?

    Thanks.
    13,000 Plaster IG Pool approx
    Hayward C5030 Cart Filter
    Emerson 1081 EB653 1.0 HP 1.40 S.F. 3450 RPM
    Pool Calculator, Pool School, TF Test Kits

  13. Back To Top    #13
    dmanb2b's Avatar
    Join Date
    Apr 2009
    Location
    NY
    Posts
    3,728

    Re: How important is CYA when shocking, other questions, res

    You should be done shocking pretty soon...just check PH when FC is below 10ppm and adjust then if needed
    24'x52" AGP (13,500 Gallons), Intex SWG, (2)Solar Bear 4x20 panels, Hayward S220T Filter, 1/2hp Pentair Superflo

    Pool School, TFTestKits, Pool Calculator

  14. Back To Top    #14

    Join Date
    Mar 2010
    Location
    Spring, TX
    Posts
    1,082

    Re: How important is CYA when shocking, other questions, res

    I may need more shocking time but I think I should be done soon as well. Today I was trying to fix a pipe connected to my booster pump. A whole lot of DE got back into the pool. It seems to be clearing up now, but I did run the manual vac that conencts to the pump to suck back up the DE that settled to the bottom of the pool. Is this something that may cause me to have to shock longer? Also what can DE settled on the bottom of a pool do? I know there is no tear in my grids as when the pump is one no DE gets back into the pool.

    Thanks.
    13,000 Plaster IG Pool approx
    Hayward C5030 Cart Filter
    Emerson 1081 EB653 1.0 HP 1.40 S.F. 3450 RPM
    Pool Calculator, Pool School, TF Test Kits

  15. Back To Top    #15
    JasonLion's Avatar
    Join Date
    May 2007
    Location
    Silver Spring, MD
    Posts
    37,879

    Re: How important is CYA when shocking, other questions, res

    A little excess DE in the pool for a few hours won't have any effect on how long you need to shock. If it sat there for days it could have some effect. For the most part extra DE is just unsightly, but if it sits around long enough undistrubed it can become the catalyst for the formation of a biofilm that supports bacterial growth.
    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

  16. Back To Top    #16

    Join Date
    Mar 2010
    Location
    Spring, TX
    Posts
    1,082

    Re: How important is CYA when shocking, other questions, res

    Well shocking is done. Only lost .5 PPM over night. My levels are high right at 21 FC so will let it drop on its own. The CYA should start showing up towards the end of the week. Added 5 lbs in weight of CYA so that should bring it up to around 30 or so.

    I will do another check tomorrow morning just to be sure on my results.
    13,000 Plaster IG Pool approx
    Hayward C5030 Cart Filter
    Emerson 1081 EB653 1.0 HP 1.40 S.F. 3450 RPM
    Pool Calculator, Pool School, TF Test Kits

  17. Back To Top    #17

    Join Date
    Mar 2010
    Location
    Spring, TX
    Posts
    1,082

    Re: How important is CYA when shocking, other questions, res

    Checked this morning and lost no FC. Now have to allow the FC to drop on its own.
    13,000 Plaster IG Pool approx
    Hayward C5030 Cart Filter
    Emerson 1081 EB653 1.0 HP 1.40 S.F. 3450 RPM
    Pool Calculator, Pool School, TF Test Kits

  18. Back To Top    #18
    JasonLion's Avatar
    Join Date
    May 2007
    Location
    Silver Spring, MD
    Posts
    37,879

    Re: How important is CYA when shocking, other questions, res

    Congratulations!
    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

  19. Back To Top    #19

    Join Date
    Mar 2010
    Location
    Spring, TX
    Posts
    1,082

    Re: How important is CYA when shocking, other questions, res

    Quote Originally Posted by JasonLion
    Congratulations!
    Thanks.

    This winter I need to do a better job at keeping with testing. I did not test near enough during the winter. I guess I just got used to not losing hardly any chlorine when cold that I just got very lax on testing.
    13,000 Plaster IG Pool approx
    Hayward C5030 Cart Filter
    Emerson 1081 EB653 1.0 HP 1.40 S.F. 3450 RPM
    Pool Calculator, Pool School, TF Test Kits

  20. Back To Top    #20

    Join Date
    Mar 2010
    Location
    Spring, TX
    Posts
    1,082

    Re: How important is CYA when shocking, other questions, res

    Now that I am done with the shocking, should I worry about CH yet? My FC was 12 as of yesterday. Still waiting for it to get under 10 so I can test and adjust pH some.

    Thanks.
    13,000 Plaster IG Pool approx
    Hayward C5030 Cart Filter
    Emerson 1081 EB653 1.0 HP 1.40 S.F. 3450 RPM
    Pool Calculator, Pool School, TF Test Kits

Page 1 of 2 12 LastLast

Posting Permissions

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