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Thread: How many pools with CYA over 100?

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    Join Date
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    Buckeye, AZ 85326
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    How many pools with CYA over 100?

    I have several questions for pool owners with high CYA (over 80ppm).

    1)How many of you have high CYA over 80ppm?

    2)How long has your CYA been over 80ppm?

    3)Do you backwash?

    4)Have you had algae issues?

    5)What is you pool finish: plaster, pebble, vinyl or other.

    Thanks
    11,872 Gallon IG Shotcrete play pool
    Blue Granite Pebble Sheen finish
    Hayward SwimClear c4025, Navigator & Tristar 1.75hp pump
    2' Powerfall

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    Re: How many pools with CYA over 100?

    Not now, but when I came here I had CYA over 100, up to 150 as far as I know, based on strips.

    No backwashing ever, cart filter. But the pool was probably nearly drained and refilled after Hurricane Ike to recover so fast from being black water. It was clean a week later when we saw it again. With pucks and shock I ran it back to 150 CYA in a matter of months.

    Yes, there was algae, mossy green algae in cracks of the rocks on the steps, flat green algae on rock coping, waterfall rocks were very very green, and some faint algae on the shady side from time to time. Never bad anywhere, the water looked nice, but green here and there.

    Plaster pool, rock waterfall.
    23,000 gallon in ground pool with rock waterfall and spillover spa, Aqualink control system, Polaris 380 cleaner, Purex Triton Clean&Clear Plus cartridge filter. Located in The Woodlands, Texas.

    Pool owner since Nov 2008, Trouble Free since April 2009. Happy to help when I can.

  3. Back To Top    #3

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    Re: How many pools with CYA over 100?

    When I inherited the pool 2 years ago the CYA was well over 100. Within a month of buying the house I had my first and only algae outbreak. The next season, spring of 2009, I found TFP and the BBB method and haven't looked back since. I dare say I will never have algae again!

    If you really want to know the percentage of high CYA pools that develop algae, especially pool store customers accustomed to chlorinating with pucks, just scroll through the Algae forum on this board.
    20K gal IG plaster pool, Manually chlorinated with 6% bleach, 1.5 HP Sta-Rite Dura-Glas II pump, Pentair FNS Plus 48 DE filter, Polaris 280

  4. Back To Top    #4

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    Re: How many pools with CYA over 100?

    When we got rid of our pool service our CYA was in the 150 range. We maintained a low FC level as per pool store and quickly developed an algae issue that was very difficult to shake.

    I've been letting it come down on it's own. Tested last week around 95.

    Have kept the FC up in the 6 - 13 range and have been problem free algae wise for 6 months or so.

    I must say I'm kinda on the fence on the issue. Having it high allows me to add chlorine less often (The suggested FC range is bigger so I have more room to float in it) Since I dont have a real cover, get tons of sun and have some schedule issues that make daily maintenance impossible I'll probably aim for a CYA a little on the high side. (That's not advice by the way)

    My guess is the more organic matter your pool collects the less advisable high CYA is, since the nature of your chlorine usage changes. (Protecting it from sunlight = good, protecting it from organic matter = bad)

    If you're wondering about letting yours come down with time, rather than replacing a substantial amount of water - for me it hasn't been a problem, but you probably have to accept the possibility that it could be.

    DE filter, I dont really backwash. I break it down and thoroughly clean it 3 times a year.
    30 year old Plaster
    16K Gal Plaster | Compupool SWG | Intelliflow VF | TF-100

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    Richard320's Avatar
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    Re: How many pools with CYA over 100?

    I do! I do!

    Last time I tested, about 10 days ago, I was still at 140. That's as close as I can tell, since I dilute 50/50 with tap water. It has been higher than that since at least last October when I bought the house. The filter's been backwashed once so far. I have pumped out some water and diluted with rainwater (drought year and all that) too. Never had an algae problem, but I keep on top of the levels knowing that if I do get one, I'll have no choice but to drain or try to get reverse osmosis done - closest R/O service is 2 counties away. The pool is plaster. It was supposedly redone 2 years ago.
    16K freeform gunite with spa; Pentair 4000 DE filter; Century Whisperflow 1 HP; Pentair Minimax heater.
    Troublefree does not mean Maintenancefree. It's like brushing your teeth: You can spend a couple minutes a day and pennies a week or go to the dentist once a year and spend several thousand dollars.
    A pool is like a pet - you have to feed it every day, even the days you don't want to play with it!

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    svenpup's Avatar
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    Re: How many pools with CYA over 100?

    Richard, I am curious...what is you daily chlorine demand?
    TFP Method Advanced Intermediate
    • 17,500 gallons - In Ground - Plaster - Hayward Swimclear 3020 Cartridge Filter - Sta-Rite Max-E-Glas Main Pump upgraded with A.O. Smith B2980 E-Plus New Centurion Two-Speed Motor - Polaris 280 Cleaner with Polaris PB4-60 Booster Pump - TightWatt2 Timer - Taylor K-2006 Test Kit - Pool Pilot Digital Nano SWCG

    Helpful Links: Pool School, BBB for Beginners, How to Shock (hint...it's a process not a product), Chlorine/CYA Chart, Jason's Pool Calculator

  7. Back To Top    #7
    Richard320's Avatar
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    Re: How many pools with CYA over 100?

    Quote Originally Posted by svenpup
    Richard, I am curious...what is you daily chlorine demand?
    About 2.5 ppm/day. Of course it varies a little depending on temperature and use.
    16K freeform gunite with spa; Pentair 4000 DE filter; Century Whisperflow 1 HP; Pentair Minimax heater.
    Troublefree does not mean Maintenancefree. It's like brushing your teeth: You can spend a couple minutes a day and pennies a week or go to the dentist once a year and spend several thousand dollars.
    A pool is like a pet - you have to feed it every day, even the days you don't want to play with it!

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    Re: How many pools with CYA over 100?

    Richard - What's your typical FC count?

    I'm averaging 1.5ppm per day with warm (88-90*) water, full sun, and 3 ppl for 90 minutes or so per day.

    I have some of those ridiculous sun ring things as well as a partial cover.
    16K Gal Plaster | Compupool SWG | Intelliflow VF | TF-100

  9. Back To Top    #9
    Richard320's Avatar
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    Re: How many pools with CYA over 100?

    Quote Originally Posted by lightingguy
    Richard - What's your typical FC count?

    I'm averaging 1.5ppm per day with warm (88-90*) water, full sun, and 3 ppl for 90 minutes or so per day.

    I have some of those ridiculous sun ring things as well as a partial cover.
    Seldom gets above 17; only when I get lazy and don't measure the chlorine but just eyeball half a jug or whatever. Typically it's kept between 12 and 14. It gets sun all day long, and a lot of aeration because about 20% of the flow goes through the hot tub section.
    16K freeform gunite with spa; Pentair 4000 DE filter; Century Whisperflow 1 HP; Pentair Minimax heater.
    Troublefree does not mean Maintenancefree. It's like brushing your teeth: You can spend a couple minutes a day and pennies a week or go to the dentist once a year and spend several thousand dollars.
    A pool is like a pet - you have to feed it every day, even the days you don't want to play with it!

  10. Back To Top    #10

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    Re: How many pools with CYA over 100?

    Me too. The pool is around 90 ppm CYA. We do a lot of backwashing when the pool is being used, daily sometimes. Without the backwashing, the CYA would be closer to 120 based on the amount of trichlor/dichlor we've got through. We got from 0 to 80 CYA in about six weeks (!), but haven't had any algae thankfully. The pool is seasonal and usually emptied annually, so we get away with it.
    90k litres, outdoor in ground pool, concrete, painted (I hate paint)
    Sta-Rite 5P2R 1.5 Hp pump, undersized sand filter (needs upgrading).

  11. Back To Top    #11

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    Re: How many pools with CYA over 100?

    When I first got my plaster pool 7 years ago, I used Trichlor pucks/tabs in a floating feeder. I had a mostly opaque electric safety cover and the pool wasn't used every day so the chlorine usage was low at around 0.7 ppm FC per day. Nevertheless, after one-and-a-half seasons of use (around 11 months) my Cyanuric Acid (CYA) level went from 30 ppm to 150 ppm. I usually kept the FC level at around 3 ppm. I had an oversized cartridge filter, so no backwashing and only once-a-year cleaning and I had a pool cover pump that put winter rain water into the drain (not into the pool) so there was very little water dilution. In spite of using algaecide (that was mixture of Polyquat and linear quat), though only every other week, after getting near 150 ppm CYA my pool started to get a higher-than-normal chlorine demand followed by dull and then cloudy water as an algae bloom was developing. The acidic Trichlor pucks also rusted mounts for stainless steel bars below the water line.

    Since that time, I've been using 12.5% chlorinating liquid and have had my CYA at 30 ppm and more recently at 45 ppm and not had any algae in spite of 3000+ ppb phosphates in the pool except for one time I let the chlorine get to zero accidentally during one spring startup (really just heating the pool since it is still chlorinated and circulating in the winter since it doesn't freeze).

    Some pools will be lucky enough to get a high CYA level without a proportionately higher FC level and not get algae, but most will unless an algaecide is used or the nutrients are very low. Even then, the risk is still higher than simply using an appropriate FC level relative to the CYA level.
    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"

  12. Back To Top    #12

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    Re: How many pools with CYA over 100?

    oh,oh, me too, me too!! Okay, not anymore, but I did. It was about 150, now is 70. Inherited the pool with the house, it will be 5 years the end of August. I knew nothing!!!!! Was told to put these tablets in the skimmer and vaccuum as needed. We had like 3 days of rain and the pool was a very deep green! Looking back, since now I'm a little smarter, while vaccuuming since we had bought the place there was an algae bloom starting. I was ready to rip that dang thing right out, over $300 spent within a month and hours of cleaning that mess up. Closed it up end of Sept and started reading whatever I could find for boards that winter. Which eventually led me here. I preach BBB and pool water chemistry to anyone that wants to learn. I want anyone thinking about getting a pool to learn correctly first. I didn't drain/replace to get mine lowered, it's just the initial partial drain in the fall, some backwashing and waste when too full due to rain. It's eventually come down, a few more years and it will be right where I want it. Now hopefully I can get my TA to do the same, which now it's sitting at about 160. Was up to about 200 or more when I started. I've not had any problems the past 4 seasons, because I know what I'm doing now.
    Mona SE MN
    24' round 48" high AG
    Meteor Sand Filter
    1.5 HP pump

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