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Thread: Help with SLAM and Clearing water

  1. Back To Top    #1

    Join Date
    May 2015
    Washington il

    Help with SLAM and Clearing water

    Since 4/27/16 we've been slamming the pool. Bought a Taylor test kit. Water has cleared very well but we're just not getting to 100% clear like we hope to be. Appx. putting in 5 gallons of 12.5% chlorine daily according to CYA chart. Backwashing nightly and brushing in morning and night when adding chlorine. Put DE in filter. Vac a few times but sediment just settles back in same spots on bottom of pool. Have had rain which added to water to pool but we did add a bit of well water too.

    cya 75
    FC 16.4
    cc 0.1
    tc 5
    ph 7.2
    alk 100
    cal hard 240

    Overnight test is losing bt 2-4 ppm FC. Decided to stop slamming and let the chlorine drop so we can start heating and swimming next week. Should we still be slamming instead? Seems like SO much chlorine.

    Also, we do have phosphates which I'm told eat up the chlorine so is it possible the phosphates are eating chlorine at night and not organics. I mean how can algae be in there STILL?
    32,000 gallon inground pool with vinyl liner - sand filter - well water

  2. Back To Top    #2
    Mod Squad woodyp's Avatar
    Join Date
    Apr 2010
    East Texas

    Re: Help with SLAM and Clearing water

    "Decided to stop slamming and let the chlorine drop so we can start heating and swimming next week." You have NOT passed the OCLT test. It takes what it takes.

    There's your problem! That, and a sand filter is most likely to take longer to get it crystal clear. It is safe to swim up to SLAM level for your CYA. Carry on!

    If you stop now, you lose all the investment in time, hard work and chlorine money only to start all over.
    16x32x52" Steel Cornelius Miramar AGP Vinyl liner 13,100 gal. Buried 2 ft.
    2 Speed Hayward Power-Flo Matrix 85 g.p.m. 22" 250lb. sand filter hard plumbed
    Pool Rover Jr., Pool Blaster Max, Diver Dave TF100 Test Kit/Speed Stir
    Margaritaville Frozen Concoction Maker, Liqour Chiller, & Drink Mixer & Party Tub----Collect 'um all!

  3. Back To Top    #3
    TFP Guide
    Mr Bruce's Avatar
    Join Date
    Mar 2014
    Greenville, SC

    Re: Help with SLAM and Clearing water

    You would have been better off draining some of that water in the beginning, would have taken less chlorine. Especially in IL.
    35K gallon Krystle Krete (Plaster) - Sand Filter - TF100
    Test Kits - Pool Math - Chlorine/CYA/Target/Slam Chart

  4. Back To Top    #4

    Join Date
    May 2016

    Re: Help with SLAM and Clearing water

    Based on the chart, shock level at CYA of 75 would be closer to 30. Pool School - Chlorine / CYA Chart

    If you are running back and forth between 16 and 20 ppm of FC, you may simply not have enough chlorine in the pool to get the complete kill.
    18k plaster IG pool - cartridge filter - Pentair Superflo VS - Taylor K-2006
    Dolphin Nautilus Robotic pool cleaner

  5. Back To Top    #5
    pinguy's Avatar
    Join Date
    May 2015

    Re: Help with SLAM and Clearing water

    You need to continue the SLAM at the proper FC level until you pass all 3 criteria.

    1) Water is completely clear
    2) OFCLT is passed
    3) CC < .5

    Don't worry about phosphates.
    28k IG gunnite/diamond brite pool built May 2015, K2006 test kit w/ SpeedStir & Salt
    AquaCal Autopilot Digital Salt Chlorine Generator
    Pentair STA-RITE DE Filter
    Pentair Intellipro VS main pump/ MAX-E-PRO waterfall pump
    Pentair UltraTemp Heat Pump

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