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Thread: Trichlor tabs raise CYA too much... but what else?

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    Trichlor tabs raise CYA too much... but what else?

    I understand from the consensus here that using Trichor tabs in an automatic feeder will eventually raise CYA too much.
    But what is the alternative?

    I work long hours during the week and tend to the pool on the weekends, so I can't be manually measuring chlorine levels and adding bleach daily. When CYA gets high, what else can I do to keep the pool chlorinated? (I'm not ready to buy a salt-water chlorine generator yet)
    George
    Antigua, Guatemala
    12x24 in ground marcite w/ 8 heliocol solar panels

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    Mod Squad JohnT's Avatar
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    Re: Trichlor tabs raise CYA too much... but what else?

    Bleach. Either hand added or in a Liquidator.

    But no matter what method you use, you need to test the water more often than just weekends, and adding bleach doesn't take as long as testing.
    TFP Moderator
    20K Gallon 20X36 Vinyl Inground
    Hayward S244T Sand Filter with 1HP Whisperflo Pump. Liquidator C-201 and Solar Heat

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    JasonLion's Avatar
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    Re: Trichlor tabs raise CYA too much... but what else?

    Or rethink getting a SWG. At this time a SWG is the simplest way to take care of a pool.
    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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    Re: Trichlor tabs raise CYA too much... but what else?

    I have a fairly long day, too. My system is to take the daily walk out to the pool with a gallon of bleach and a measuring cup along with my test kit. Check the chlorine and Ph, add usually a cup of bleach (10%) and ba-bing! done until tomorrow! Just takes a minute to do this. Normally I do not have to add anything to adjust the Ph; with bleach the Ph will tend to creep up, but it's pretty slow. I add a cup or so of acid maybe once a week.
    Above ground soft side Omega pool
    20 feet diameter, 4 feet deep
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    Re: Trichlor tabs raise CYA too much... but what else?

    First, Trichlor won't necessarily raise your CYA to much. If you are in a climate where you have to winterize the pool, you are probably taking 2-3 feet of water out of the pool to winterize and probably another 2-3 feet in the spring when you open. In a 6 month swimming
    season (like the one here in Chicago!) you'll never add to much CYA to the pool through Trichlor.
    Second, why can't you check the pool once a week? It all depends on how you use the pool. If you have 20 kids in the pool every day; than you better be checking it every day. However, if you have an autocover and only use the pool on the weekends; than you might be able to get away with once a week. Every situation/pool is different.
    Despite my ramblings; the fact remains that more is better!

    Andy
    25k Inground Vinyl - 3ft to 10ft, Tagelus TA-60 Sand, Minimax 400 Heater, Save T3 autocover.

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    Re: Trichlor tabs raise CYA too much... but what else?

    jellyfish,

    If you get a pool cover, then you can slow down the rate of chlorine loss from sunlight such that you can add chlorine twice a week instead of every day -- that's the situation in my own pool. Of course, then you'll have the labor of removing and replacing the pool cover -- ours is an electric safety cover so is no hassle.

    Andy,

    A smaller pool and shorter swim season help, but also having a sand filter with regular weekly backwashing helps dilute the water. Otherwise, you'd be surprised with how quickly Trichlor increases CYA. In my own pool, I started out (5 years ago) using Trichlor, but I have a 7-month swim season, a 16,000 gallon pool, and a cartridge filter (so no backwashing) and no dilution over the winter. After one and a half seasons, my CYA climbed from 30 ppm to 150 ppm. This was with an FC usage of less than 1 ppm per day! The problems that ensued are what got me looking into pool water chemistry.

    For every 10 ppm FC added by Trichlor, it also adds 6 ppm to CYA. So even with a low 1 ppm FC per day usage, that's an increase in CYA of 18 ppm per month or 108 ppm in one 6-month season. Weekly backwashing in a smaller pool helps reduce this increase.

    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"

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    frustratedpoolmom's Avatar
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    Re: Trichlor tabs raise CYA too much... but what else?

    Quote Originally Posted by h2oando
    First, Trichlor won't necessarily raise your CYA to much. If you are in a climate where you have to winterize the pool, you are probably taking 2-3 feet of water out of the pool to winterize and probably another 2-3 feet in the spring when you open. In a 6 month swimming
    season (like the one here in Chicago!) you'll never add to much CYA to the pool through Trichlor.
    Second, why can't you check the pool once a week? It all depends on how you use the pool. If you have 20 kids in the pool every day; than you better be checking it every day. However, if you have an autocover and only use the pool on the weekends; than you might be able to get away with once a week. Every situation/pool is different.
    Despite my ramblings; the fact remains that more is better!

    Andy
    Never say never. As a suburban Chicago resident who has survived a CYA level of over 100, and lived to tell the tale, I can attest that you can have those conditions you described and still get CYA too high from the use of tri-chlor. Happened to me. That being said, it doesn't mean it's an all or nothing, there are ways to use tri-chlor and minimize the impact on your pool. But for me when you factor in expense, bleach is simple to do and cheaper than tri-chlor.
    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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    AnnaK's Avatar
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    Re: Trichlor tabs raise CYA too much... but what else?

    I maintain my pool with a combination of trichlor and liquid chlorine. I get a 20 ppm increase of CYA over a period of about 6 months. My FC loss in a 24 hour period is 1 - 1.5 ppm. My feeder is set to 1/8 of full capacity and I add about 60 oz liquid chlorine over a week's period, approximately 20 oz every other day. I test pH daily, FC/CC twice a week.

    I arrived at this scheme after two full seasons of testing the water daily and logging the results. I also kept, and still keep, a daily log of weather (especially heavy rains), backwashing, refilling. Given an adequate data set and knowing how your water behaves you will eventually develop a feel for your pool without having to do a daily care and feeding routine.
    AnnaK

    12,500 gal AGP, Hayward sand filter, Pentair 2-speed pump, timer.
    Please visit our Pool Issues pages for information about step weights, managing the solar cover, and PoolSkim.

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