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Thread: CYA drop?

  1. Back To Top    #1

    Join Date
    Sep 2015
    Union, NJ

    CYA drop?

    Hi All
    Hopefully this great forum can once again answer my question. I've been maintaining my pool as a first year owner all season using the TFPM. I've yet to have any issues and my water is perfectly balanced. I just did my second CYA test of the season just out of curiosity. I find the reading to be a bit hard to decipher but seems like my CYA has dropped from 80 at opening to almost 50. Is that possible with back washing every two weeks, adding some water here and there and normal rainfall? If not, it could be that I misread the test but it's so hard to see when that black dot is actually gone.
    14k Gallon, Above Ground
    Sand Filter
    Taylor K-2006
    Union, NJ
    Sun All Day

  2. Back To Top    #2

    Join Date
    May 2015
    Land O Lakes, FL

    Re: CYA drop?

    Could be, with those variables and testing variations.
    2016 Pool Build: 12k IG Blue Granite Pebblesheen, Travertine Coping & Pavers, Pentair IntelliFlo, Intellichlor, Easytouch, Clean & Clear 320, Heliocol Solar - TF-100 test kit w/ SpeedStir
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  3. Back To Top    #3
    borjis's Avatar
    Join Date
    Aug 2014
    Pacific NW

    Re: CYA drop?

    that sounds reasonable given your water capacity.

    I have a bit less water and cya & ch levels are affected when I do multiple back washes or draining due to rain fall.
    16x32 IG Vinyl, 13,000 Gals. Hayward S-244T sand filter, SP2810X15 pump
    (1.5 HP motor) Raypak PR266AEN (266k btu) gas heater. TF-100 Test Kit.
    Dolphin E10 Cleaning Robot.

  4. Back To Top    #4

    In the Industry

    duraleigh's Avatar
    Join Date
    Apr 2007
    Sebring, Florida

    Re: CYA drop?

    That is a pretty good size drop but within reasonableness. CYA seems to drop on it's own by about 5 ppm monthly and it sounds like you are backwashing too much so it all adds up.

    You should backwash when you see a 25% rise in your filter pressure. Many TFP'rs go all summer with maybe one backwash. Use the gauge as the test.
    Dave S.
    42k vinyl and concrete pool, 1.5hp pump, 140gpm filter
    TFTestkits , PoolMath , Pool School

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