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Thread: Super High CYA

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    Join Date
    Jun 2007
    Location
    Eastern NC
    Posts
    53

    Super High CYA

    I have searched all over the site but can't find what I'm looking for. I did a CYA test with my K2006 kit and the water in the test filled to the top of the tube is still clear, I can see the black dot plane as can be. I know this is limited info but is there a reason it tests like this. The kit was bought last year and I just got a fresh set of supplies in for it last week and used them. Water is clear. Still coping with the NC yellow pine pollen and those long stringy things off of trees. I have not done the major cleaning to my DE filter system yet. Was going to wait until the pollen season was over, at least the pine pollen. Pool was open all winter. Pump has been running 24/7 for the past month. All of last year my CYA was at 100, I have only used standard bleach all of last year. Nothing with CYA. The pool has been partially drained, maybe a 1/4 at the most, we are in drought here and I hate to use the water if I don't have too. This spring rain has brought it up past the skimmer twice. I had to drain back down to skimmer level. Much needed rain and I'm not complaining.

    FC 0
    CC0
    TA 150
    PH 7.6
    CYA don't know test doesn't go any higher than 9 on the tube.

    24,500 VIG
    24k IG Vinyl D.E. Filter, SWG

  2. Back To Top    #2
    JasonLion's Avatar
    Join Date
    May 2007
    Location
    Silver Spring, MD
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    37,879
    If you can still see the black dot of the CYA test very clearly then your CYA level is zero (or very close to zero). It sounds like you may have lost all of your CYA over the winter, which happens sometimes.
    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

  3. Back To Top    #3

    Join Date
    Jun 2007
    Location
    Eastern NC
    Posts
    53
    That is a relief so to speak. I battled with it being high all last year and thought I would have to drain and refill to get it down. With the drought that wasn't much of an option. What would be the best way to get it back up? Buy just CYA or use Pucks and Pool chlorine that has it in it untill the level comes up?
    Thanks
    24k IG Vinyl D.E. Filter, SWG

  4. Back To Top    #4

    Join Date
    Mar 2007
    Location
    San Rafael, CA USA
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    12,082
    You've got several options. You can use Trichlor pucks/tabs which slowly erode over days, but that will also require pH Up since the Trichlor is very acidic, or you can use Dichlor granules which dissolve relatively quickly, or you can get pure CYA which is slow to dissolve, or you can get a liquid slurry form of CYA. I compare the cost of these different options here. The lowest cost is either the pure CYA or the use of Dichlor (the latter being reasonable because it also contains chlorine). I'm using Dichlor as my source of chlorine right now because my CYA is low. Most people on this forum use the pure CYA to raise the CYA level and put it in a sock or panty hose and hang it over a return flow since that just takes a couple of days to dissolve.

    Richard
    16,000 gallon outdoor in-ground 16'x32' plaster pool; Pentair Intelliflo VF pump; Pentair IntelliTouch i9+3s control system; Jandy CL-340 square foot cartridge filter
    12 Fafco solar panels; Purex Triton PowerMax 250 natural gas heater (200,000 BTU/hr output); automatic electric pool safety cover; 4-wheel pressure-side "The Pool Cleaner"

  5. Back To Top    #5
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    Re: Super Hight CYA

    Quote Originally Posted by PoolDad2
    CYA don't know test doesn't go any higher than 9 on the tube.

    24,500 VIG
    You are looking at the wrong scale on the tube. They CYA scale starts with 100 ppm near the bottom of the tube closed to the black dot and will be marked 30 ppm near the top of the tube with other numbers in between but not evenly spaced.

    The 9 you see is 9 ml. The ml scale on the tube is not used for the CYA test.

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