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Thread: Who's CYA and CH to believe

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    Join Date
    Jun 2011
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    San Diego California
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    Who's CYA and CH to believe

    Yesterday I did a water test and had the following results;

    FC - 4
    CC - 0
    TA - 90
    PH - 7.6
    CH - 350
    CYA - 55

    I previously posted that I'm having difficulty keeping my PH down, and my FC is burning at 5ppm/day at least. I figured I'd take a sample into the pool store to see what they would read. They provided the following;

    TC - 0
    TA - 70
    PH - 7.6
    CH - 250 (100 less than mine)
    CYA - 30 (15 less than mine)

    Since I've only owned the pool a couple months, I've not had to shock it yet, but one recommendation on why I was burning through FC was a stubborn algae somewhere that is eating it up, so maybe a shock would help. Prior to getting the water tested at the pool shop, I started the shock using the CYA table with a target FC of 22-24. For some reason, whatever I expect my FC to be (based off chlorine % and volume), it is usually twice as much. Anyway, I added enough chlorine that my test shows 26ppm.

    Should I believe the pool shop test over mine for CH and CYA? If their CYA is correct, am I to be concerned with a FC in the 20's? Given my rate of FC burn, I'm wondering if their CYA result is better and thus the reason why I go through so much FC.

    Water looks fine, and my overnight loss was 2ppm, but the sun was just up when I tested it. I'll double check again tonight to be sure.
    IG, 13,000 gal, concrete, DE, VS Intelliflo Pump, Intellichlor SWG

    San Diego, Ca.

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    Mod Squad Bama Rambler's Avatar
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    Re: Who's CYA and CH to believe

    What test kit are you using?
    If it's one of the recommended kits then I'd believe your own testing.
    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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    Re: Who's CYA and CH to believe

    I'm using the K-2006, and the pool shop is using the Leslie's TF100. So basically both are recommended.
    IG, 13,000 gal, concrete, DE, VS Intelliflo Pump, Intellichlor SWG

    San Diego, Ca.

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    Mod Squad Bama Rambler's Avatar
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    Re: Who's CYA and CH to believe

    Trust your own.
    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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    frogabog's Avatar
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    Re: Who's CYA and CH to believe

    Quote Originally Posted by markmac
    I'm using the K-2006, and the pool shop is using the Leslie's TF100. So basically both are recommended.
    The TF100 is from TFTestkits.net

    Leslie's doesn't seem to actually sell a FAS-DPD test even though they claim to, and will sell you whatever is on the shelf even if it's not the one you're asking for. If they used no powder, they are using a Taylor 2005 copy in a leslie's box.

    If you tested at 26ppm, and they test at 0ppm, it stands to reason that their test was bleached out since you know you had chlorine in it. The DPD (Taylor 2005) test doesn't even test above 5ppm.

    CYA is subjective. Two different people might get different results. If they did the tube/black dot test in the store under weird light...??? Well who cares more about the result? You or them? You might even double check yourself a few times just to be sure.
    Where kids swim in 54 degree water, turn blue, and giggle happily cuz they got a POOL!
    Year 3 BBB -15' x 48" Intex Metal Frame - Was using (2) 1000gph Intex cartridge filters (see Full time pumping Intex). 2012, converted to 1600gph and sand filter+SWG = Sand filter love affair!
    Don't waste time and energy looking for a better value on test kits, the TF100 is the best deal around. I did the looking and spent the extra money, but you don't have to make the same mistake. Just go here: TFTestkits. I use Pool Calculator for min/max, and shocking chlorine levels.

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