Become a TFP Supporter Pool Math Forum Rules Pool School
Results 1 to 10 of 10

Thread: CYA reading odd

  1. Back To Top    #1

    Join Date
    Sep 2009
    Location
    Bellmawr, NJ
    Posts
    31

    CYA reading odd

    Hello everyone.
    That time of year again.
    Opening the pool and trying to get an initial test out of the way.

    Im using the TFTest Kit bought new 1 year ago.
    Last year I had a CYA of about 35.
    Drained no more than 1/3 of total pool capacity during closing last year.
    Open pool this year and get NO reading for CYA. The water doesnt even look cloudy in the test tube.

    Kinda nervous now...am I doing something wrong, is my reading wrong, testing stuff expired?

    Dont wanna try to raise the CYA reading more just to find out I needed to replace the test kit.
    Thoughts would be appreciated.

    Anthony
    18X36 IG Vinyl Grecian ~26K gallons
    Unidentified pump, Pentair Quad DE 100

  2. Back To Top    #2
    Mod Squad Bama Rambler's Avatar
    Join Date
    Jun 2009
    Location
    SouthWest Alabama
    Posts
    22,347

    Re: CYA reading odd

    If you stored the reagent inside it's most likely still good. Can you hold FC in it? If so how much chlorine did it take to get it to hold?

    There are several reports of CYA going away over winter.
    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

  3. Back To Top    #3

    In the Industry

    duraleigh's Avatar
    Join Date
    Apr 2007
    Location
    Sebring, Florida
    Posts
    30,084

    Re: CYA reading odd

    Trust your testing.....you almost surely have 0 CYA.

    Draining 1/3 when you closed would lower 35ppm to about 20ppm and, depending on winter rains, etc. it would not be unusual for the rest to be unmeasurable.

    I would plan on purchasing enough to get back to 35ppm.

    PS - given reasonable care, the R-0013 reagent will last much longer.....in to next season.
    Dave S.
    42k vinyl and concrete pool, 1.5hp pump, 140gpm filter
    TFTestkits , PoolMath , Pool School

  4. Back To Top    #4

    Join Date
    Sep 2009
    Location
    Bellmawr, NJ
    Posts
    31

    Re: CYA reading odd

    Thanks to both of you for the help.

    The testing stuff was kept inside, so I will assume it is good.
    I added 4 gallons of 6% an hour ago, so will test now to see what that gets me.
    I was just trying to get the testing out of the way to determine what I was going to add.

    I will plan on adding enough to get me back up to 35ish...and will chlorinate based on that number.

    Edit:
    Just tested...after 4 gallons of 6% and an hour of filter time I came up with 7.5 FC and .5CC
    Lower number than expected...according to the pool calculator I should have ended up nearly 11.5 FC.

    I will test again in the morning and see where I end up.

    Thanks again.
    Anthony
    18X36 IG Vinyl Grecian ~26K gallons
    Unidentified pump, Pentair Quad DE 100

  5. Back To Top    #5
    Mod Squad Bama Rambler's Avatar
    Join Date
    Jun 2009
    Location
    SouthWest Alabama
    Posts
    22,347

    Re: CYA reading odd

    You probably had the CYA convert to ammonia and that's what got most of your FC you added. You may have to add a few times to get it to hold.
    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

  6. Back To Top    #6

    Join Date
    Sep 2009
    Location
    Bellmawr, NJ
    Posts
    31

    Re: CYA reading odd

    Quote Originally Posted by Bama Rambler
    You probably had the CYA convert to ammonia and that's what got most of your FC you added. You may have to add a few times to get it to hold.
    Fair enough and could explain my drop to 5.5FC from 7.5 last night. Still getting .5 CC.
    Will have to wait till tonight to get CYA. I'm sure most/all chlorine will burn off, but the boss doesn't seem to care

    Thanks again.
    Anthony
    18X36 IG Vinyl Grecian ~26K gallons
    Unidentified pump, Pentair Quad DE 100

  7. Back To Top    #7
    XsAllOverIt's Avatar
    Join Date
    Dec 2010
    Location
    Mount Airy, Maryland
    Posts
    560

    Re: CYA reading odd

    You can also double check your CYA reading by making a 1/2 solution and see if the CYA drops in half, i.e. 1/2 pool water, 1/2 tap water.
    18 x 36 Inground Gunnite, White Plaster 21K gallon
    18" raised spa, 8' Diameter (620 gallon)
    Triton II Sand filter, Intellichlor IC40 SWG
    Pentair Pump, Max-E-Therm 400 BTU
    Lamotte ColorQ PRO 7-Plus test kit
    TFT-100 test kit

  8. Back To Top    #8

    Join Date
    Jun 2010
    Location
    San Antonio
    Posts
    424

    Re: CYA reading odd

    Quote Originally Posted by XsAllOverIt
    You can also double check your CYA reading by making a 1/2 solution and see if the CYA drops in half, i.e. 1/2 pool water, 1/2 tap water.
    If the CYA is zero, half of zero is still zero.
    Larry in Texas

    Above ground 7,700 gallons, 19 inch sand filter ( 2 sq. ft.), Liquidator, and a WaterWay Hi-Flo Pump with an A.O. Smith 1 hp SF 1.0 motor.

  9. Back To Top    #9
    XsAllOverIt's Avatar
    Join Date
    Dec 2010
    Location
    Mount Airy, Maryland
    Posts
    560

    Re: CYA reading odd

    DUH! Oopsss!
    18 x 36 Inground Gunnite, White Plaster 21K gallon
    18" raised spa, 8' Diameter (620 gallon)
    Triton II Sand filter, Intellichlor IC40 SWG
    Pentair Pump, Max-E-Therm 400 BTU
    Lamotte ColorQ PRO 7-Plus test kit
    TFT-100 test kit

  10. Back To Top    #10

    Join Date
    Jun 2010
    Location
    San Antonio
    Posts
    424

    Re: CYA reading odd

    Been There Done That
    Larry in Texas

    Above ground 7,700 gallons, 19 inch sand filter ( 2 sq. ft.), Liquidator, and a WaterWay Hi-Flo Pump with an A.O. Smith 1 hp SF 1.0 motor.

Posting Permissions

  • You may not post new threads
  • You may not post replies
  • You may not post attachments
  • You may not edit your posts
  •