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Thread: SLAMing for green algae... a question about FC shock level before getting started

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    Join Date
    May 2017
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    Las Vegas, NV
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    SLAMing for green algae... a question about FC shock level before getting started

    Hi everyone! I have been a long time lurker. Thanks to all of you, I have managed to keep my pool sparking clean for several years up until recently...

    Yesterday, I noticed green algae on the steps in my pool. I immediately brushed the entire pool and spent hours re-reading the pool school articles and various threads on here. This led me to go out and purchase jugs of bleach so I could begin the SLAM process. I tested for FC, CC, pH, and CYA and these are the results:

    FC = 0.4 ppm
    CC = 0.2 ppm
    pH = 7.6 (added MA to drop it to 7.2)
    CYA = 40

    The problem I'm having now is with determining the appropriate FC shock level for my pool. I visited the Chlorine/CYA chart here: Pool School - Chlorine / CYA Chart

    But, I have a SWG pool and the chart doesn't have any recommended FC shock levels for SWG pools with CYA <60.

    Can someone please help me calculate the appropriate FC shock level for my SWG pool with a CYA reading of 40?


    Thank you all in advance!

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    Mod Squad Texas Splash's Avatar
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    Jun 2014
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    South-Central Texas, Marion/San Antonio
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    Re: SLAMing for green algae... a question about FC shock level before getting started

    Hello and welcome to TFP! Yes, when you have to SLAM, just treat the pool as a non-SWG pool since you're using bleach to SLAM anyways. So for a CYA of 40, your FC level should be "16". You can turn down (or off) the SWG to give it a break if you like and let the bleach do its thing. Great to have you here with us at TFP.
    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.
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    Join Date
    May 2017
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    Las Vegas, NV
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    Re: SLAMing for green algae... a question about FC shock level before getting started

    Thank you so much for your help! Water is clear, CC is at 0, and hoping to pass an OCLT tomorrow morning thanks to you!

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