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Thread: SLAM that never ends…?

  1. Back To Top    #1

    Join Date
    May 2016

    SLAM that never ends…?

    8 days ago, we noticed the pool was just a little hazy - not really cloudy, but it seemed to have lost its luster. We tested everything and began SLAM, including daily brushing. Our CC is never over .5, and I test it every time to be sure. Our CYA is somewhere between 35 and 50 (I still don't quite have the finesse for reading that thing), so we set SLAM FC goal at 20.

    Pool has been super sparkly and clear for several days, but we can't pass the OCLT. We got close yesterday at 1.5 loss, but this am was 3.5 loss. Do we continue SLAMing???

    My Pool: 20+K gal vinyl IG; Hayward sand filter with 1 HP pump; Inline chlorinator

  2. Back To Top    #2
    TFP Guide
    Mr Bruce's Avatar
    Join Date
    Mar 2014
    Greenville, SC

    Re: SLAM that never ends…?

    This is the time to remove any ladders, pool lights, check behind skimmer weirs, etc. There is something hiding somewhere!
    35K gallon Krystle Krete (Plaster) - Sand Filter - TF100
    Test Kits - Pool Math - Chlorine/CYA/Target/Slam Chart

  3. Back To Top    #3
    Mod Squad Texas Splash's Avatar
    Join Date
    Jun 2014
    South-Central Texas, Marion/San Antonio

    Re: SLAM that never ends…?

    Good morning Jill. You do need to continue until you pass the OCLT. You may have one of two things happening:
    1 - You still have algae hiding somewhere that is consuming your FC
    2 - Your CYA is actually on the lower end which would require a lower FC. I learned from my own trial & error on OCLTs that more is not always better. So if your CYA is only designed to accommodate 12 FC (as an example), trying to pass an OCLT at 20 or more could result in additional FC loss even with no sunlight.

    So I would first rule-out any hiding places for algae (lights, ladders, steps, etc). If you're good there, consider doing an OCLT at about 12-14FC one time. Also, keep practicing with the CYA testing since that a very critical part of all of this as well.

    Proper lighting is critical for the CYA test, so you want to test for CYA outside on a bright sunny day. Taylor recommends standing outside with your back to the sun and the view tube in the shade of your body. Use the mixing bottle to combine/gently mix the required amounts of pool water and R-0013 reagent, let sit for 30 seconds, then gently mix again. Then, while holding the skinny tube with the black dot at waist level, begin squirting the mixed solution into the skinny tube. Watch the black dot until it completely disappears. Once it disappears, record the CYA reading. After the first test, you can pour the mixed solution from the skinny view tube back to the mixing bottle, shake, and do the same test a second, third, or fourth time to instill consistency in your technique, become more comfortable with the testing, and validate the CYA reading.
    Good luck, and thanks for being a TFP supporter!
    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
    If you enjoyed your TFP experience, please consider donating to Support TFP!

  4. Back To Top    #4
    Mod Squad
    Join Date
    Aug 2012
    DFW, TX

    Re: SLAM that never ends…?

    One more idea, has the sand filter had a deep cleaning? Here's how, Deep Cleaning a Sand Filter

    If you say yes to all of the above being clean and checked then drop FC back to 10ish and see how the OCLT does.
    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

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