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Thread: New to Pool Care - To Slam or Not to Slam?

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    Join Date
    Jun 2015
    Mansfield, TX

    New to Pool Care - To Slam or Not to Slam?

    I am new to posting, but have been doing lots of reading. I started my own pool care a week ago. I have an 18,000 gallon in ground chlorine pool. After canceling my pool service, I bought a Taylor K2005 test kit and went to work. After draining 3' of water out of my pool due to high conditioner and CH levels, I finally got everything in balance. However, I have algae growing in several areas and seem to have sand on the bottom which I'm thinking may be algae as well. I broke down my DE filter last weekend and cleaned and inspected all the panels. No rips or tears, so there should be no DE coming back into the pool. And I haven't seen any coming through the jets. So now that my water is clear (way more so than when my pool guy was doing it), I need to get this algae gone. I'm going to test now and will post my levels shortly.

    Any feedback is greatly appreciated!

    Just tested my levels and they are as follows:
    FC - 2ppm
    TC - 2ppm
    CC - 0ppm

    PH 7.8
    TA 80ppm
    CH 320ppm
    CYA 40ppm

    I can't seem to maintain chlorine levels. I tested chlorine on Thursday evening and CC was 0, just like now. I added a 3" tablet to the skimmer basket and one to the floater. As well as adding 120 oz of bleach per the pool calculator. We left town that night, so no one has been in the pool. We returned home yesterday and this morning was the first time I've tested it. So, after a few days, my chlorine is back down again.

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    Mod Squad pooldv's Avatar
    Join Date
    Aug 2012
    DFW, TX

    Re: New to Pool Care - To Slam or Not to Slam?

    Welcome to TFP!

    Yes, SLAM. Your FC is below minimum. This allows algae to grow which is now consuming more chlorine. It is only going to get worse.

    Chlorine is set based on CYA and Chlorine CYA Chart. FC should always be at target or slightly higher and never below minimum.

    Pool School - SLAM - Shock Level And Maintain
    Pool School - ABCs of Pool Water Chemistry

    BTW, pucks add CYA, Pool School - How to Chlorinate Your Pool

    also, add your pool info to your signature as shown here, Pool School - Getting Started
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    Mod Squad Texas Splash's Avatar
    Join Date
    Jun 2014
    South-Central Texas, Marion/San Antonio

    Re: New to Pool Care - To Slam or Not to Slam?

    Another Lone Star member ... welcome! You already received your initial advice, so stick with it and let us know if you have any more questions. Remember, a SLAM is not an overnight process, so be prepared for a few days of constant FC testing and brushing. You'll get it. Welcome!
    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
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    Richard320's Avatar
    Join Date
    Jan 2010
    San Dimas, CA (LA County)

    Re: New to Pool Care - To Slam or Not to Slam?


    The first part of the SLAM is Shock Level. For 40 CYA, that's 16 FC. Your K-2005 can't measure that high. To turn it inmto a K-2006, order the FAS-DPD test. There's no other way to accurately measure FC at the levels you need.

    If there's a lot of algae, it will all disappear pretty quickly. That the second half of SLAM: And Maintain. There's the rub. You don't know how much is left unless you let FC drop well below 5 so you can read it, and then you have to go back up to 16 FC. Get the test kit coming and fumble through as well as you can. Frequent and thorough brushing will speed it along. Algae develops a slimy biofilm scab that protects it from chlorine, so you need to brush it off so the chlorine can kill it.
    16K freeform gunite with spa; Pentair 4000 DE filter; Century Whisperflow 1 HP; Pentair Minimax heater.
    Troublefree does not mean Maintenancefree. It's like brushing your teeth: You can spend a couple minutes a day and pennies a week or go to the dentist once a year and spend several thousand dollars.
    A pool is like a pet - you have to feed it every day, even the days you don't want to play with it!

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