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

Thread: Need Help afer draining multiple times to lower CYA.

  1. Back To Top    #1

    Join Date
    Jun 2015
    Location
    League City, TX
    Posts
    17

    Need Help afer draining multiple times to lower CYA.

    Looking for guidance after draining pool twice to lower CYA. Just finished refilling and not sure what's next. I received a bad gallon of stabilizer, since I had never used didn't realize there was a problem until it was to late. About halfway thru the gallon it was solid. Can't totally blame the pool store since I overlooked the fact it could take days or a week for my CYA to register and kept adding more. My CYA went up, per Pool Math I drained the pool about 2/3. Waited a about a week for it to stabilize (no pun intended) tested today at 30-50 after using the half pool water and half faucet water method (60-100). Drained again halfway and refilled with fresh water. Other than the CYA the water was clear (daily brushing and vacuum) and all numbers were holding steady. Listing my numbers prior to draining below. My SWG alarm triggered for low salt last night which I added, and lost after draining.
    Please Help Thanks!
    Using the HTH 6 way test strips for now. Will invest in a better kit for next season.
    FC-3
    PH-7.8
    TA-80
    TH-200
    CYA- 60 to 100
    Pro-Series 14'x42" Frame AGP, 3300 gal, Intex 635T Filter Pump and SWG. Intex Deluxe Skimmer.
    HTH 6-Way Test Strips.

  2. Back To Top    #2
    Mod Squad zea3's Avatar
    Join Date
    Jul 2009
    Location
    Houston, Texas
    Posts
    9,202

    Re: Need Help afer draining multiple times to lower CYA.

    Hi, welcome to TFP! Raise your salt to the correct level for your SWG and lower your pH to 7.2 Bump up the FC to 4ppm with liquid chlorine until the SWG is able to keep the FC at 3-4ppm.
    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 2014
    Location
    Hope Mills, NC
    Posts
    556

    Re: Need Help afer draining multiple times to lower CYA.

    60 - 100 is too broad a range to even use. 60 is ok, 70 is ok 80 you could live with, 90 or 100 no good.

    Until you get accurate numbers, dont even worry about it.
    16 x 32 17500 gallons
    Vinyl in-ground
    Hayward 250# Sand Filter
    1 HP Pump
    Hayward SWG

  4. Back To Top    #4

    Join Date
    Jun 2015
    Location
    League City, TX
    Posts
    17

    Re: Need Help afer draining multiple times to lower CYA.

    The 30-50 was prior to refilling. Before the first refill I was registering 100 according to pool store testing. I was giving the water some time to circulate before retesting. Will test and repost.
    Thank you.
    Pro-Series 14'x42" Frame AGP, 3300 gal, Intex 635T Filter Pump and SWG. Intex Deluxe Skimmer.
    HTH 6-Way Test Strips.

  5. Back To Top    #5

    Join Date
    Jun 2015
    Location
    League City, TX
    Posts
    17

    Re: Need Help afer draining multiple times to lower CYA.

    These are my current readings about 3 1/2 hours since refill with pump running. Adding the Acid and bleach now. Separately as read in other post. Will post new numbers tomorrow. Thank you for any further direction.

    Salt is test is just below 5.3 (2000 ppm).
    FC-2
    PH-8.4
    TA-120
    TH-200
    CYA-30 to 50
    Pro-Series 14'x42" Frame AGP, 3300 gal, Intex 635T Filter Pump and SWG. Intex Deluxe Skimmer.
    HTH 6-Way Test Strips.

  6. Back To Top    #6
    Mod Squad pooldv's Avatar
    Join Date
    Aug 2012
    Location
    DFW, TX
    Posts
    23,999

    Re: Need Help afer draining multiple times to lower CYA.

    +1 on what zea3 said above.
    TFP Moderator
    If TFP helped you or saved you money - Become a TFP Supporter! <--Click here
    2012 build and pics, 20k gal gunite, black onyx pebblesheen, OK flagstone, IntellifoVS, cart filter w/Pleatco, IC40 SWG, Solartouch, 5 12'x4' solar panels, HP50HA heat pump, 8mil solar cover, borates, TF-100 test kit, SONOS, Doheny's Discovery Robot, hot tub on bleach

  7. Back To Top    #7

    Join Date
    Jun 2015
    Location
    League City, TX
    Posts
    17

    Re: Need Help afer draining multiple times to lower CYA.

    These are my new numbers. Should I add the Washing Soda now or will it throw my PH and TA more out of wack? Also should I go ahead and turn on my SWG since adding the bleach or wait until it's regular schedule tomorrow/ tonight?
    Feeling a bit overwhelmed!

    New Numbers:
    FC-3
    PH-7.5
    TA-40
    TH-200
    CYA-30-50
    Pro-Series 14'x42" Frame AGP, 3300 gal, Intex 635T Filter Pump and SWG. Intex Deluxe Skimmer.
    HTH 6-Way Test Strips.

  8. Back To Top    #8
    Texas Splash's Avatar
    Join Date
    Jun 2014
    Location
    South-Central Texas, Marion/San Antonio
    Posts
    12,981

    Re: Need Help afer draining multiple times to lower CYA.

    Turn-on your SWG and let it start working. You'll need to experiment with it over time until you figure out how much percentage and run time is required to produce enough FC on its own. Until that happens, augment with bleach to maintain that required FC range of 3-5. Make sure the FC never drops below 3. At the same time, you should have a sock soaking with more stabilizer for a target goal of at least 70. That CYA range of 70-80 is very important to protect the limited FC your SWG creates.

    Your other numbers are fine for right now. In the future though, when you post hardness, don't use TH, use CH. Normally CH doesn't apply to a vinyl pool, but since you have a SWG it may not be a bad idea to always show it. Hope this helps. Just focus on that FC quite a bit for now.
    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!

Posting Permissions

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