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

Thread: final numbers after drain to reduce CYA

  1. Back To Top    #1

    Join Date
    Sep 2015
    Location
    Charlotte,NC
    Posts
    79

    final numbers after drain to reduce CYA

    Finally got the CYA under control.

    Final numbers- CYA 55, FC 6, CC 0, PH 7.4, TA 60 Calcium 60. Water temp 60. Number look good but the CSI index seems high at -1.1. Do I need to raise my TA and CL before my final SLAM or can I leave for winter? Its a vinyl with a heater so not sure about the heater and the copper in it.

    Next is a slam. I have not done one, so pool math says for my CYA use 24 for shock FC. Maintain until my OCLT drop is less than 1 PPM and CC is less than .5(mine is zero now). Pool is crystal clear no signs of any algae which I had 3 weeks ago(I kept chlorine around 30 2 weeks ago but CYA was very high maybe 180+ that seemed to get rid of it).

    Thanks again to the forum I learned a lot since sept when I started BBB.
    Location Charlotte NC. Pool is a IG vinyl liner, 18X36 lagoon approx. 20,000 gallons odd shaped pool with different depths. 2 skimmers, 3 returns. Hayward 1HP pump, Hayward cartridge filter, Hayward chlorine feeder, Laars 250,000 BTU heater. Stenner pump with #2 tube for chlorine injection. Leslie branded Taylor test kit

  2. Back To Top    #2
    Texas Splash's Avatar
    Join Date
    Jun 2014
    Location
    South-Central Texas, Marion/San Antonio
    Posts
    12,984

    Re: final numbers after drain to reduce CYA

    CH is typically not an issue for vinyl pools as noted on the recommended levels chart of 0-350ppm, so there's no need to adjust. But if you did chose to adjust it, Poolmath shows to add 592 oz of calcium chloride which would get it back to a reasonable -0.48. In addition, adding 94 oz of baking soda will raise TA to 80 and further enhance your CSI to about -0.32. Then after the SLAM, you could let your pH rise back up to about 7.6-7.7 which will take it closer to neutral. But again, all of that isn't really necessary for your pool type.

    As for the SLAM, yes, an FC of 24 is your goal. Just follow the directions on the SLAM page and you'll be fine. Maintain is the key.
    Pat (a.k.a. Texas Splash) ~ My Pool: Viking Fiberglass; 17,888 Gal; Waterway Supreme 2-sp/2-hp pump; Hayward Ctg filter; TF-100 w/ Speed Stir
    Vital Links: POOL SCHOOL, RECOMMENDED LEVELS, RECOMMENDED CHEMICALS, Poolmath Calculator, SLAM, Chlorine/CYA CHART.
    If you enjoyed your TFP experience, please consider donating to Support TFP!

  3. Back To Top    #3
    Pflugerpool's Avatar
    Join Date
    Jun 2014
    Location
    Pflugerville, TX
    Posts
    65

    Re: final numbers after drain to reduce CYA

    Why are you doing a SLAM if your combined chlorine is 0 and your pool is crystal clear? What's your current OCLT result?
    15,000 gallon 16x30 IG w/vinyl liner built in 2006, Hayward cartridge filter, Hayward 1HP Single Speed pump, Taylor K2006.

  4. Back To Top    #4

    In the Industry

    duraleigh's Avatar
    Join Date
    Apr 2007
    Location
    Sebring, Florida
    Posts
    30,085

    Re: final numbers after drain to reduce CYA

    Why are you doing a SLAM if your combined chlorine is 0 and your pool is crystal clear?
    Yep. There seems no need.
    Dave S.
    42k vinyl and concrete pool, 1.5hp pump, 140gpm filter
    TFTestkits , PoolMath , Pool School

  5. Back To Top    #5
    borjis's Avatar
    Join Date
    Aug 2014
    Location
    Pacific NW
    Posts
    2,059

    Re: final numbers after drain to reduce CYA

    Quote Originally Posted by Texas Splash View Post
    CH is typically not an issue for vinyl pools as noted on the recommended levels chart of 0-350ppm, so there's no need to adjust.
    I used to think that too, but he's got that Heater (same one i have) and the warranty is no good unless the CH is at least 200.
    16x32 IG Vinyl, 13,000 Gals. Hayward S-244T sand filter, SP2810X15 pump
    (1.5 HP motor) Raypak PR266AEN (266k btu) gas heater. TF-100 Test Kit.
    Dolphin E10 Cleaning Robot.

  6. Back To Top    #6

    Join Date
    Sep 2015
    Location
    Charlotte,NC
    Posts
    79

    Re: final numbers after drain to reduce CYA

    Honestly never did a shock before the winter so really not sure what to do I just figured that's what everyone did. Also I don't cover and close just run pump all the time when its freezing. Been doing that 13 years never had a issue. If I don't need to slam I won't then. Just looking for advise using this method. Figure I could bring cl up.
    Location Charlotte NC. Pool is a IG vinyl liner, 18X36 lagoon approx. 20,000 gallons odd shaped pool with different depths. 2 skimmers, 3 returns. Hayward 1HP pump, Hayward cartridge filter, Hayward chlorine feeder, Laars 250,000 BTU heater. Stenner pump with #2 tube for chlorine injection. Leslie branded Taylor test kit

  7. Back To Top    #7

    TFP Guide
    PAGirl's Avatar
    Join Date
    Jun 2012
    Location
    Central PA
    Posts
    2,388

    Re: final numbers after drain to reduce CYA

    You could run an overnight chlorine loss test, just to reassure yourself a SLAM isn't needed.
    26' X 52" Intex Ultra Frame. Intex Sand Filter
    26' X 52 Intex Ultra Frame Install
    You can lead a horse to (clear) water, but you can't force him to swim in it!

  8. Back To Top    #8
    Texas Splash's Avatar
    Join Date
    Jun 2014
    Location
    South-Central Texas, Marion/San Antonio
    Posts
    12,984

    Re: final numbers after drain to reduce CYA

    Miwitte, that makes more sense now. You're not really SLAMming in the technical sense, just thinking of taking your water to SLAM/Shock level in preparation for closing. However if you don't really close the pool like others up north (disconnect pump, cover, etc), and you have no indication of algae, then you really don't need to do that either. Just keep doing what you're doing. The colder water will slow-down FC consumption and make pool care much easier on you. As for the CH, check your warranty paperwork for your model. Many folks have no issue with low CH, but your spec may dictate otherwise. If so, Poomath will help as I noted above.
    Pat (a.k.a. Texas Splash) ~ My Pool: Viking Fiberglass; 17,888 Gal; Waterway Supreme 2-sp/2-hp pump; Hayward Ctg filter; TF-100 w/ Speed Stir
    Vital Links: POOL SCHOOL, RECOMMENDED LEVELS, RECOMMENDED CHEMICALS, Poolmath Calculator, SLAM, Chlorine/CYA CHART.
    If you enjoyed your TFP experience, please consider donating to Support TFP!

  9. Back To Top    #9

    Join Date
    Sep 2015
    Location
    Charlotte,NC
    Posts
    79

    Re: final numbers after drain to reduce CYA

    That's what I thought, so SLAM is really only if you actually close it. I have a weird shaped pool so I would need a expensive custom cover. The guy that built the pool told me to just to the pump in the winter and if its below freezing then keep it running all day and night. It really only gets below freezing maybe 10-15 total nights then its up to 45-50 in the day. I am so glad I got the CYA down now I can run my chlorine much lower I am pretty sure its not good for the liner to be running at 19 FC like it needs to be with a CYA of 200. Ill try and balance my CSI index a little better but things look good.

    Thank god that guy fixed that leak for me so easy.
    Location Charlotte NC. Pool is a IG vinyl liner, 18X36 lagoon approx. 20,000 gallons odd shaped pool with different depths. 2 skimmers, 3 returns. Hayward 1HP pump, Hayward cartridge filter, Hayward chlorine feeder, Laars 250,000 BTU heater. Stenner pump with #2 tube for chlorine injection. Leslie branded Taylor test kit

  10. Back To Top    #10
    borjis's Avatar
    Join Date
    Aug 2014
    Location
    Pacific NW
    Posts
    2,059

    Re: final numbers after drain to reduce CYA

    Quote Originally Posted by miwitte View Post
    I am pretty sure its not good for the liner to be running at 19 FC like it needs to be with a CYA of 200.
    With your pool over stabilized that high it's counter acting the chlorine's effectiveness, so it's not likely it was any harsher on the liner. at a CYA level of 50 you bet it would be harsh. and on your swimwear and hair too.

    Though it is a good feeling to have the CYA at a proper level and spend less on chlorine.
    16x32 IG Vinyl, 13,000 Gals. Hayward S-244T sand filter, SP2810X15 pump
    (1.5 HP motor) Raypak PR266AEN (266k btu) gas heater. TF-100 Test Kit.
    Dolphin E10 Cleaning Robot.

  11. Back To Top    #11

    TFP Guide

    pabeader's Avatar
    Join Date
    May 2015
    Location
    Dallas Ga
    Posts
    4,064

    Re: final numbers after drain to reduce CYA

    borjis has got it mostly right. Just to put a fine point on it, I'm adding this thought. It isn't FC by itself, but the relationship between FC and CYA, that matters to liners and people and cloths. A FC of 20 with a CYA of 100, is the same, as far as actual 'working' chlorine, as a FC of 10 and a CYA of 50.
    The CYA acts as a buffer to the chlorine so that only a fraction is actually active. As that fraction gets used up, the CYA bound chlorine gets released, which keeps the percentage constant.
    Bob - Palm Beach by San Juan Pools. approx 5000 gals., Pentair 320 cartridge filter (all new guts installed by me), Goldline SWG, 'New to me' Kreepy Krauly Sand Shark, Intermec 104 Timer Test kit: TF-100 w/Speed Stir

  12. Back To Top    #12

    Join Date
    Sep 2015
    Location
    Charlotte,NC
    Posts
    79

    Re: final numbers after drain to reduce CYA

    Ok so final #s today
    FC 7.5
    CC 0.0
    PH 7.6
    ALKY 80
    CYA 50
    CL 210
    CSI -.3
    OTCL showed no loss. Pool sparkles and shimmers haven't seen it look this good in a long time. Looks like I am set just need to keep chlorine up over winter. Going to figure out some type of dosing pump setup over winter. Also looks like gallons are 21,000 played with pool math to figure out how much I added to make changes and 21000 seems pretty close.
    Location Charlotte NC. Pool is a IG vinyl liner, 18X36 lagoon approx. 20,000 gallons odd shaped pool with different depths. 2 skimmers, 3 returns. Hayward 1HP pump, Hayward cartridge filter, Hayward chlorine feeder, Laars 250,000 BTU heater. Stenner pump with #2 tube for chlorine injection. Leslie branded Taylor test 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
  •