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Thread: Trying to lower my CYA and it turned to a green swamp today

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    Trying to lower my CYA and it turned to a green swamp today

    Was battling with pink bacterium a few weeks ago.
    Using dichlor for the last two years almost exclusively.

    got rid of the pink bacterium I thought, then it started to come back, had the pool store test the CYA....you guessed it 100+.
    So I ordered the big test kit from tft. Started reading and noticed I was doing it all wrong.

    So I drained water until I had about 1 foot in the shallow end and refilled. CYA test at the pool store 100+.
    pool is starting to get a green ting to it and gray stuff is starting to accumulate
    Drained water again to try to get the CYA down so I cold treat it.
    Re filling this morning and the green explodes. Threw in a bunch of cal-hypo
    Test kit came in!
    CYA 100+
    diluted the pool water with drinking water 50% and CYA test of 60. So I still have 120 CYA.
    Calculator says to shock at 28, I'm at 31 FC and it seems to be holding well.
    Still green, hasn't flipped to aqua.

    I was going to close next weekend. Do I continue the slam or wait for the water to get cold and try to kill it off in the winter?
    In ground irregular shape Vinyl pool 20,000 gallons, Hayward S244T Pro Series High-Rate Sand Filter, Waterway 1hp SVL56 pump, 24hr timer set for 8 hrs/day runtime typically, Diving Board, 12' deep end 3.5' shallow end, solar cover, 250,000 Btu Natural Gas Bryandt heater, Using Liquid Bleach for chlorine, built in 2000. TF-100

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    Re: Trying to lower my CYA and it turned to a green swamp to

    Where are you located (nearby major city), and what is the water temperature in the pool?
    Outdoor 14,000 gallon IG plaster pool built in 2000 with spillover spa, 2 hp WhisperFlo pump with MagneTek motor, Sta-Rite cartridge pool filter with 300 ft2 filtration area and 0.33 gpm/ft2 filtration rate, Aquabot Rapids 4WD robotic pool cleaner, Raypak digital gas heater, and Intermatic mechanical timer located in the Dallas-Fort Worth metroplex

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    Re: Trying to lower my CYA and it turned to a green swamp to

    Detroit, mi
    water is 70F due to the 20,000 gals of water I added/drained
    In ground irregular shape Vinyl pool 20,000 gallons, Hayward S244T Pro Series High-Rate Sand Filter, Waterway 1hp SVL56 pump, 24hr timer set for 8 hrs/day runtime typically, Diving Board, 12' deep end 3.5' shallow end, solar cover, 250,000 Btu Natural Gas Bryandt heater, Using Liquid Bleach for chlorine, built in 2000. TF-100

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    Smykowski's Avatar
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    Re: Trying to lower my CYA and it turned to a green swamp to

    I think your biggest obstacle is your CYA. Anything above 100 is just a guess (precision is lost in the dilution method), and we generally don't recommend SLAMing at those kind of levels even if they are accurate. I'd certainly like to hear what others have to say, but if your swim season is over and you drain at all to close, I would just wait til spring. Open it up early and take care of it next April.
    33' round, 23,000 gal AG vinyl , 1HP 2spd PowerFlo Matrix downsized with 3/4HP impeller (X2), Hayward S180T 150# sand filter (X2), Hayward H250 NG heater Pool Store year 1 - $850 for 2 months; Pool Store year 2 - $440 for 2 months, TFPC year 1 - $170 for 4 months; TFPC year 2 - $95 for 4.5 months
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    Mod Squad woodyp's Avatar
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    Re: Trying to lower my CYA and it turned to a green swamp to

    Hard to believe you've drained that rascal twice and STILL have cya at 120? Why aren't you SLAMming with plain old beach instead of cal-hypo?
    16x32x52" Steel Cornelius Miramar AGP Vinyl liner 13,100 gal. Buried 2 ft.
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    Re: Trying to lower my CYA and it turned to a green swamp to

    I'm confused on the CYA being so high still.....

    I need to find a good local source of liquid bleach. Last time I brought plain old bleach there was a leak and it bleached the carpet in the van....
    In ground irregular shape Vinyl pool 20,000 gallons, Hayward S244T Pro Series High-Rate Sand Filter, Waterway 1hp SVL56 pump, 24hr timer set for 8 hrs/day runtime typically, Diving Board, 12' deep end 3.5' shallow end, solar cover, 250,000 Btu Natural Gas Bryandt heater, Using Liquid Bleach for chlorine, built in 2000. TF-100

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    Re: Trying to lower my CYA and it turned to a green swamp to

    Firstly, a belated welcome to TFP
    Quote Originally Posted by JimTMich
    I'm confused on the CYA being so high still.....
    If you have been using dichlor exclusively for two years I would think that the initial test result of 120 would have been way low.

    Are you following the test procedures exactly? Watch this video and make sure you are doing it just like that (sunny day, back to the sun, pour back in bottle and retest a couple times to confirm). If you are, then I'm stumped except that apparently you need to keep working to bring it down before you try fighting the green. If your water temperature is above 60 you might as well work on clearing this before you close, it will only be worse in the spring. If your water temp is below 60 then it will probably be about the same work then as it is now so either way really.
    JD - 28' Round Above Ground Pool, 17,000 Gallons. Dual speed Jacuzzi pump with cartridge filter. Dual speed 1 HP pump, Hayward S210T sand filter
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    Re: Trying to lower my CYA and it turned to a green swamp to

    Quote Originally Posted by Donldson
    Firstly, a belated welcome to TFP
    Quote Originally Posted by JimTMich
    I'm confused on the CYA being so high still.....
    If you have been using dichlor exclusively for two years I would think that the initial test result of 120 would have been way low.

    Are you following the test procedures exactly? Watch this video and make sure you are doing it just like that (sunny day, back to the sun, pour back in bottle and retest a couple times to confirm). If you are, then I'm stumped except that apparently you need to keep working to bring it down before you try fighting the green. If your water temperature is above 60 you might as well work on clearing this before you close, it will only be worse in the spring. If your water temp is below 60 then it will probably be about the same work then as it is now so either way really.

    Thanks for the video link! I'll do that today. Does it take a day or two for the CYA to re-distribute itself when drain/refill? I did the test only hours after refill was complete?
    In ground irregular shape Vinyl pool 20,000 gallons, Hayward S244T Pro Series High-Rate Sand Filter, Waterway 1hp SVL56 pump, 24hr timer set for 8 hrs/day runtime typically, Diving Board, 12' deep end 3.5' shallow end, solar cover, 250,000 Btu Natural Gas Bryandt heater, Using Liquid Bleach for chlorine, built in 2000. TF-100

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    Re: Trying to lower my CYA and it turned to a green swamp to

    Welcome Jim. If you want to carry a little less, the easiest place to get 10% chlorine is meijers in the 4pack boxes. Stronger than laundry bleach but in the end given the added strength not really that much more expensive. Cheapest source of bleach for me in Michigan is Aldis but I got sick of carting it around and the "murder scene clean up" jokes

    My favorite source of 12% chlorine was a pool store that used to recycle the bottes and have them in 4packs in a plastic container for no leaks, but their hours got really erratic so. Gave up on them last month...easier to just pick up the 10% while doing groceries (I'm on the west side of the state, so that place wouldn't have helped you anyway.)

    I wanted to share a few observations since you're a fellow Michigander. First off, its going back up to the 80s next week...are you sure you want to close this soon? To get my chlorine to hold over winter here, I don't close til almost the end of October (despite the leaves). Granted, part of that is because I will still heat the pool and use it on any day its above 70 outside, especially after a workout in am.

    But the consensus is that its best to close when the water is consistently down to 50. If you're closing yourself -- eg on your own schedule -- I'd say no rush. If you have a service co closing you, you could reschedule.

    In your shoes, I'd continue the slam if my goal were to open clean in the spring. Once you're using liquid chlorine to maintain and fully "pool schooled" you're not likely to have to worry about this sort of thing again, so its a matter of when you want to start. You can also just call it quits, take it to high shock level, cover it up, and attack the problem in early spring when the water's cold and you get more bang for your chlorine buck. The high cya might help hold your chlorine longer that way. But if you have time to get your water where you want it now
    in terms of cya and sanitation, and you hold off closing til the temps are more consistently low, you'll likely have a nicer season next year and you might even get a few "Indian summer" swims in!

    Best wishes whichever way you go. Just remember that if you slam, be sure to maintain the slam level to outpace the algae.
    In ground extended Grecian, 22,000 gal, Hayward 220t sand filter, vinyl liner, dolphin m4 supreme.
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    Re: Trying to lower my CYA and it turned to a green swamp to

    Thanks guys, draining the pool now to take another crack at lowering the cya. After watching th video on cya testing i tried again and get 90 to 100. so hopefully can get i down to 50 with this drain. Then slam and finish out the year.
    In ground irregular shape Vinyl pool 20,000 gallons, Hayward S244T Pro Series High-Rate Sand Filter, Waterway 1hp SVL56 pump, 24hr timer set for 8 hrs/day runtime typically, Diving Board, 12' deep end 3.5' shallow end, solar cover, 250,000 Btu Natural Gas Bryandt heater, Using Liquid Bleach for chlorine, built in 2000. TF-100

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    Re: Trying to lower my CYA and it turned to a green swamp to

    Drained and shocked till dead, now re-filling. We'll see if it stays dead and how far the CYA comes down.
    I'll call the pool store tomorrow about liquid.
    Menards has closed out all their pool liquid and the laundry liquid area looked pretty beat up.......
    I May scout Meijers or Walmart. Where do you find it at Meijers, in the laundry soap area I suppose?
    I'm in West Michigan as well. Kazoo
    In ground irregular shape Vinyl pool 20,000 gallons, Hayward S244T Pro Series High-Rate Sand Filter, Waterway 1hp SVL56 pump, 24hr timer set for 8 hrs/day runtime typically, Diving Board, 12' deep end 3.5' shallow end, solar cover, 250,000 Btu Natural Gas Bryandt heater, Using Liquid Bleach for chlorine, built in 2000. TF-100

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    Re: Trying to lower my CYA and it turned to a green swamp to

    It's actually in seasonal with the pool stuff AND in the center aisle at my meijer...on sale today for $9-something a case, which means it should be on special all week. I'm in Grand Rapids...assume Kzoo stores will be the same

    (ps, if you're up in GR this week for any reason, the Knapps Corners meijer still has it as of today.)
    In ground extended Grecian, 22,000 gal, Hayward 220t sand filter, vinyl liner, dolphin m4 supreme.
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    Re: Trying to lower my CYA and it turned to a green swamp to

    Pool filled, CYA 70, FC 38 and holding. Filtering from the bottom.
    In ground irregular shape Vinyl pool 20,000 gallons, Hayward S244T Pro Series High-Rate Sand Filter, Waterway 1hp SVL56 pump, 24hr timer set for 8 hrs/day runtime typically, Diving Board, 12' deep end 3.5' shallow end, solar cover, 250,000 Btu Natural Gas Bryandt heater, Using Liquid Bleach for chlorine, built in 2000. TF-100

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    Re: Trying to lower my CYA and it turned to a green swamp to

    Thanks for the tip swampwoman!
    In ground irregular shape Vinyl pool 20,000 gallons, Hayward S244T Pro Series High-Rate Sand Filter, Waterway 1hp SVL56 pump, 24hr timer set for 8 hrs/day runtime typically, Diving Board, 12' deep end 3.5' shallow end, solar cover, 250,000 Btu Natural Gas Bryandt heater, Using Liquid Bleach for chlorine, built in 2000. TF-100

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    Re: Trying to lower my CYA and it turned to a green swamp to

    CYA 60, FC 32 (cover off). The water has definitely taken on that white/green appearance. pH 8.2? I don't have a broad range test. TA 220.
    In ground irregular shape Vinyl pool 20,000 gallons, Hayward S244T Pro Series High-Rate Sand Filter, Waterway 1hp SVL56 pump, 24hr timer set for 8 hrs/day runtime typically, Diving Board, 12' deep end 3.5' shallow end, solar cover, 250,000 Btu Natural Gas Bryandt heater, Using Liquid Bleach for chlorine, built in 2000. TF-100

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    Mod Squad jblizzle's Avatar
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    Re: Trying to lower my CYA and it turned to a green swamp to

    The pH test reads artificially high when the FC > 10ppm.
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    Re: Trying to lower my CYA and it turned to a green swamp to

    Quote Originally Posted by jblizzle
    The pH test reads artificially high when the FC > 10ppm.
    Thanks! That's very important information that I didn't know!
    In ground irregular shape Vinyl pool 20,000 gallons, Hayward S244T Pro Series High-Rate Sand Filter, Waterway 1hp SVL56 pump, 24hr timer set for 8 hrs/day runtime typically, Diving Board, 12' deep end 3.5' shallow end, solar cover, 250,000 Btu Natural Gas Bryandt heater, Using Liquid Bleach for chlorine, built in 2000. TF-100

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    Re: Trying to lower my CYA and it turned to a green swamp to

    Enjoyed a dip in the pool yesterday. Thanks!
    In ground irregular shape Vinyl pool 20,000 gallons, Hayward S244T Pro Series High-Rate Sand Filter, Waterway 1hp SVL56 pump, 24hr timer set for 8 hrs/day runtime typically, Diving Board, 12' deep end 3.5' shallow end, solar cover, 250,000 Btu Natural Gas Bryandt heater, Using Liquid Bleach for chlorine, built in 2000. TF-100

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    Mod Squad jblizzle's Avatar
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    Re: Trying to lower my CYA and it turned to a green swamp to

    Jason, TFP Moderator
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    Re: Trying to lower my CYA and it turned to a green swamp to

    Quote Originally Posted by JimTMich
    I'm confused on the CYA being so high still.....

    I need to find a good local source of liquid bleach. Last time I brought plain old bleach there was a leak and it bleached the carpet in the van....
    You have to keep the bottles upright. The lids have a vent in them. Try taking a milk crate if you have one.
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