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Thread: CYA at 40 and creeping up

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    Join Date
    May 2010
    Location
    Central Connecticut
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    157

    CYA at 40 and creeping up

    All my pool numbers test right on with my TF-100. My CYA is at 40 but has been growing week to week. I started the season low at 12 and have been able to treat it to get to 20. I have been using the 3 in triclor pucks for chlorination .. so I know it is adding some CYA. Over about 2 or 3 weeks it has rissen to 40. At what point should I be concerned?
    18x36 IG 26,000 gal, Vinyl Liner, 24" Sand filter Hayward S224T, Jandy AE3000 heatpump and 1.5 HP SuperPump. Circupool RJ45 SWG

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    Mod Squad Bama Rambler's Avatar
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    Re: CYA at 40 and creeping up

    You should be concerned about now. In CT. 40 is probably about as much CYA as you want. You could let it go to 50 but have a plan after that.

    Could you post a set of test results for us?
    Dave J. TFP Moderator
    24' x 52" Round AGP. 2hp/¼hp SPL Power-Flo 2-speed pump. 200sqft Waterway Cartridge Filter. 45MHP2(3GPD) Stenner Peristaltic Pump
    Pool School ----- Pool Math ----- TF-Test Kit

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    Join Date
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    Location
    Central Connecticut
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    Re: CYA at 40 and creeping up

    Happy Fathers day !

    Here are my latest numbers CYA is better.

    FC: 1.5
    CC: .5
    TC: 2.0
    PH: 7.4
    T/A: 100
    CH: 270
    CYA: 34

    Need to shock. Others?
    18x36 IG 26,000 gal, Vinyl Liner, 24" Sand filter Hayward S224T, Jandy AE3000 heatpump and 1.5 HP SuperPump. Circupool RJ45 SWG

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    Mod Squad Bama Rambler's Avatar
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    Re: CYA at 40 and creeping up

    How did you get those numbers?

    With a CYA of 35 your FC is too low and needs to be brought up immediately. You also need to do an overnight chlorine loss test to be sure you're not losing FC to organics.
    Dave J. TFP Moderator
    24' x 52" Round AGP. 2hp/¼hp SPL Power-Flo 2-speed pump. 200sqft Waterway Cartridge Filter. 45MHP2(3GPD) Stenner Peristaltic Pump
    Pool School ----- Pool Math ----- TF-Test Kit

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    Join Date
    May 2010
    Location
    Central Connecticut
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    157

    Re: CYA at 40 and creeping up

    Got the numbers using the FT-100 kit. As you know, the CYA test is a bit subjective. I shocked the pool last night and will check FC later today to see if it came back up.
    18x36 IG 26,000 gal, Vinyl Liner, 24" Sand filter Hayward S224T, Jandy AE3000 heatpump and 1.5 HP SuperPump. Circupool RJ45 SWG

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