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Thread: Question about CYA and SLAM

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    Question about CYA and SLAM

    I bought a home with pool. Pool is about 12000 gal + attached SPA
    Water seemed clear and there was a maintenance person. I decided to do it myself.

    There were more twists than in anticipated. The filter cracked, the pool vacuum base cracked, replaced both then water started turning green.

    The pool store tested water:
    FC : 2
    TAC: 2
    Ph 7.5
    CYA: 90
    CH:200
    TDS: 700
    Phosphates: 500

    A few days before water started turning green.

    I bought HD test kit and that showed PH > 8. so added acid. And started slam and ordered K-2006 at same time. I started adding bleach blind, one gallon at a time, 2 times a day, water looks cloudy now.

    Tested with K-2006 today,

    FC : 20
    PH: 8+ with acid demand 20 drops
    CYA: 100+ (test stops at 100)


    My questions.
    1. During SLAM is CYA test reliable? Should i forget the procedure and drain refill?
    2. Should i correct PH now or during SLAM I should not worry about it?
    Should i worry about phosphates, i know generally opinion here is not to, i have trees in backyard so leafs regularly fall into the pool.
    Anything else i should do now?

    Thank you for help
    Go Spa 742 | 310 Gal | Ozone | Lucite Cast Acryllic | 220v | Installed Aug 2013
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  2. Back To Top    #2
    Mod Squad woodyp's Avatar
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    Re: Question about CYA and SLAM

    Best thing you can do is drain and replace 50% of water. Get water to CYA level of 50 max. THEN SLAM your pool! No need to even test cya during SLAM. It ain't gonna change! No need to check PH with FC over 10 either----will check abnormally high. Forget phosphates.
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  3. Back To Top    #3

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    Re: Question about CYA and SLAM

    Thank you.

    The only reason I did CYA again was I read here that people got 90+ at pool store but lower reading when they tested with Taylor kit. I got higher. Significantly higher I believe. Wanted yo make sure maybe I am not supposes to test during slam.
    Go Spa 742 | 310 Gal | Ozone | Lucite Cast Acryllic | 220v | Installed Aug 2013
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    chiefwej's Avatar
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    Re: Question about CYA and SLAM

    The upper limit of the CYA test is 100. Your level may be much higher. Mix pool water 50/50 with tap water, test and double result, to determine how high it really is. Then you will know how much water you need to drain.
    chiefwej
    Tucson, AZ
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    Re: Question about CYA and SLAM

    I need to figure out an easy way to get water out for replacing. I am not sure if the pumping system has a way to drain. Any ideas on that? A search showed i can get sump pump rental at Home depot to help, but I am afraid, i do not know where the sump pump has been before..
    Go Spa 742 | 310 Gal | Ozone | Lucite Cast Acryllic | 220v | Installed Aug 2013
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    Mod Squad Bama Rambler's Avatar
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    Re: Question about CYA and SLAM

    If you can post a pic of the equip, or tell us what equipment you have, we may be able to come up with a way to use the pump you have now to drain the pool.
    Dave J. TFP Moderator
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    Re: Question about CYA and SLAM

    Sorry it took some time, needed to take picture, did not have it already.
    Attached Images Attached Images
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    Mod Squad jblizzle's Avatar
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    Re: Question about CYA and SLAM

    Who cares where the sump pump has been before ... you will be SLAMing anyway. They have all looked pretty clean to me.

    It does not look like you have a waste port. Although you could open the hose bib on the left of the picture and drain that way, but it will be slow and only work if you can isolate the floor drain with the valve in front of the pump.
    Jason, TFP Moderator
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    Re: Question about CYA and SLAM

    Will try to do this weekend, the water has started looking normal color so thats good news for me.
    Go Spa 742 | 310 Gal | Ozone | Lucite Cast Acryllic | 220v | Installed Aug 2013
    Grilling | Cooking | Wine | Coffee Home Roaster | Frozen Concoctions

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