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Thread: possible ez way to lower CYA

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    lindaspoolboy's Avatar
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    possible ez way to lower CYA

    a buddy of mine was told this method to lower CYA from a pool store guy.
    he says he tried it and it worked. i'm wondering what the experts here think.


    CYA is denser than water and settles to bottom of pool when left unstirred.
    He said leave the pool off for a day or two then
    close the skimmer drains and pull all the water from the pool bottom when you do normal backwashing
    (or you could use Waste setting when you have too much water in pool).

    So I needed to backwash, so I added a couple inches of water. CYA was at 120.
    Then Left pool off for one day. I closed skimmer drains
    and pulled about 3 inches of water out via the bottom drain. CYA went to 80.
    It then rained two days later and I needed to lower the water another inch or two.
    Not wanting to backwash the new Diam earth , I
    set the pool to waste, closed skimmers again. Lowered pool about one-two inches.
    CYA is now 65. Unbelievable. This is using my kit to measure.
    - lindaspoolboy
    29,000 gallon vinyl IG, Hayward 1.5hp Pump, DE Filter.

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    JasonLion's Avatar
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    Re: possible ez way to lower CYA

    The general feeling around here is that this approach doesn't work. On the other hand I don't know of anyone who has done any careful tests to prove that it doesn't work.
    19K gal, vinyl, 1/2 HP WhisperFlo pump, 200 sqft cartridge filter, AutoPilot Digital SWG, Dolphin Dynamic cleaning robot
    Creator of PoolMath and Pool Calculator. Other handy links: Support this site, TF Test Kits, Pool School

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    duraleigh's Avatar
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    Re: possible ez way to lower CYA

    CYA is denser than water and settles to bottom of pool when left unstirred.
    If that statement was true, you would never be able to accurately test for CYA as it would be constantly settling. Additionally, if the CYA does not mix evenly throughout the body of water, it would offer no protection from the sun.
    Dave S. - Forum owner
    42k vinyl and concrete pool, 1.5hp pump, 140gpm filter
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    Re: possible ez way to lower CYA

    I was in a pool product seminar once and the guy doing it said the exact opposite. That CYA stays in the upper foot of water and the fastest way to lower it is to turn off the drain and drain the pool from the skimmers!
    Of course this is pure rubbish as is the advice to turn off the pumps and drain from the bottom because "CYA is heavier than water"!
    CYA, once dissolved in the water, exists in the form of cyanurate ions and chlorinated isocyanurate compounds, in addition to cyanuric acid. This are ionic species that are dissolved in the water and can not be separated out any easier than say, salt, which becomes sodium and chloride ions in the water.
    ANYONE who has had a basic high school chemistry class will understand this.

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    Re: possible ez way to lower CYA

    Quote Originally Posted by waterbear
    I was in a pool product seminar once and the guy doing it said the exact opposite. That CYA stays in the upper foot of water and the fastest way to lower it is to turn off the drain and drain the pool from the skimmers!
    Of course this is pure rubbish as is the advice to turn off the pumps and drain from the bottom because "CYA is heavier than water"!
    CYA, once dissolved in the water, exists in the form of cyanurate ions and chlorinated isocyanurate compounds, in addition to cyanuric acid. This are ionic species that are dissolved in the water and can not be separated out any easier than say, salt, which becomes sodium and chloride ions in the water.
    ANYONE who has had a basic high school chemistry class will understand this.

    I have had College Prep Chemistry 1 and 2 in High School, plus Chemistry 101 in College, and I have to say that I don't understand it.

    It has been 16 or 17 years though.
    steve

    Above Ground / 18' Round / Vinyl Liner / Sand Filter / 100K Gas Heater / Salt Added / No Nature2

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    frustratedpoolmom's Avatar
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    Re: possible ez way to lower CYA

    Quote Originally Posted by sevver
    Quote Originally Posted by waterbear
    I was in a pool product seminar once and the guy doing it said the exact opposite. That CYA stays in the upper foot of water and the fastest way to lower it is to turn off the drain and drain the pool from the skimmers!
    Of course this is pure rubbish as is the advice to turn off the pumps and drain from the bottom because "CYA is heavier than water"!
    CYA, once dissolved in the water, exists in the form of cyanurate ions and chlorinated isocyanurate compounds, in addition to cyanuric acid. This are ionic species that are dissolved in the water and can not be separated out any easier than say, salt, which becomes sodium and chloride ions in the water.
    ANYONE who has had a basic high school chemistry class will understand this.

    I have had College Prep Chemistry 1 and 2 in High School, plus Chemistry 101 in College, and I have to say that I don't understand it.

    It has been 16 or 17 years though.
    Yes, but did you attend SIU? Just kidding!
    Helpful links: Pool School; CYA/Chlorine Chart
    24' round AG pool, 52" high, Raypak heater; Waterway 2 spd Pump;
    150 Sq ft. Clearwater Cartridge Filter; Former and DISSATISFIED "Pool Frog" owner
    http://www.PerfectlyClearPoolService.com

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