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Thread: 3" chlorine tabs without CYA

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    tacoma5050
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    3" chlorine tabs without CYA

    Why doesn't anyone manufacture 3" chlorine tabs without CYA in them? Is it not possible?

    Or if someone does, where can I buy it?

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    JasonLion's Avatar
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    Re: 3" chlorine tabs without CYA

    Yes, and no, but really no. There isn't anything that dissolves slowly and doesn't contain CYA. You can get tablets made out of cal-hypo, but they dissolve way to quickly to be used in the same way trichlor tablets are used and contain calcium.
    19K gal, vinyl, 1/2 HP WhisperFlo pump, 200 sqft cartridge filter, AutoPilot Digital SWG, Dolphin Dynamic cleaning robot
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    Re: 3" chlorine tabs without CYA

    I was actually thinking about this the other day also. You would think that someone could figure out a way.
    Kidney shaped ~ 10000 gallon Ig Plaster pool with pool cage. 120sf Cartridge filter. Pentair WhisperFlo WFDS-26, 230 Volt, 7.8/3.0 Amp, 1-1/2 Horsepower 2 speed pump, Solar panels on the roof. Heliotrope HelioMatic 4000D solar controller.

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    JasonLion's Avatar
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    Re: 3" chlorine tabs without CYA

    Disinfecting chorine is unstable and there are very few ways to stabilize it enough to transport it and still have it work in the pool. There are really only six forms available: bleach, trichlor, dichlor, cal-hypo, lithium-hypo, and chlorine gas. Each has advantages and disadvantages, there is no perfect combination.

    The best approach I have seen is a SWG, which creates the chlorine on site, so no transportation is required.
    19K gal, vinyl, 1/2 HP WhisperFlo pump, 200 sqft cartridge filter, AutoPilot Digital SWG, Dolphin Dynamic cleaning robot
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    Re: 3" chlorine tabs without CYA

    There are only a few forms of solid chlorine and only one is very slow dissolving, making it useful in erosion feeders. This is trichlor, which is a chemical made from chlorine and cyanuric acid (a chlorinated isocyanurate). The problem with this slow dissolving form of chlorine is that it will cause CYA levels to rise since once the chlorine is used up the CYA remains. The next slowest dissolving form of chlorine is calcium hypochlorite (cal hypo) which does not contain CYA but will cause calcium levels to rise over time. It dissolves very fast in comparison to trichlor so it does not work very well in erosion feeders and cannot be used in a pressurized feeder without danger of explosion so it's usually used in a plastic coated capule or tablet that is placed in the skimmer but these only last a few days at best and leave a lot of residue behind.

    All the other solid forms of chlorine (lithium hypochlorite which will not raise CYA but is very expensive to use and dichlor which will raise CYA faster than trichlor does) are very fast dissolving so they are not useful for erosion feeders.

    The two forms of chlorine tht have the LEAST side effects on water chemistry are lithium hypochlorite, a fast dissolving granular that is EXTREMELY expensive to use, and sodium hypochlorite (bleach or liquid chlorine) which is not as convenient as the dry forms of chlorine but is very economical to use.
    I hope this explains it.

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    Re: 3" chlorine tabs without CYA

    Quote Originally Posted by waterbear
    There are only a few forms of solid chlorine and only one is very slow dissolving, making it useful in erosion feeders. This is trichlor, which is a chemical made from chlorine and cyanuric acid (a chlorinated isocyanurate). The problem with this slow dissolving form of chlorine is that it will cause CYA levels to rise since once the chlorine is used up the CYA remains. The next slowest dissolving form of chlorine is calcium hypochlorite (cal hypo) which does not contain CYA but will cause calcium levels to rise over time. It dissolves very fast in comparison to trichlor so it does not work very well in erosion feeders and cannot be used in a pressurized feeder without danger of explosion so it's usually used in a plastic coated capule or tablet that is placed in the skimmer but these only last a few days at best and leave a lot of residue behind.

    All the other solid forms of chlorine (lithium hypochlorite which will not raise CYA but is very expensive to use and dichlor which will raise CYA faster than trichlor does) are very fast dissolving so they are not useful for erosion feeders.

    The two forms of chlorine tht have the LEAST side effects on water chemistry are lithium hypochlorite, a fast dissolving granular that is EXTREMELY expensive to use, and sodium hypochlorite (bleach or liquid chlorine) which is not as convenient as the dry forms of chlorine but is very economical to use.
    I hope this explains it.
    Ya i follow all that, and actually understand. But you would think someone would figure out a way to get us the best of both worlds. Slow dissolving tablets that do not jack up your pool chemistry . I can wish..
    Kidney shaped ~ 10000 gallon Ig Plaster pool with pool cage. 120sf Cartridge filter. Pentair WhisperFlo WFDS-26, 230 Volt, 7.8/3.0 Amp, 1-1/2 Horsepower 2 speed pump, Solar panels on the roof. Heliotrope HelioMatic 4000D solar controller.

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    Re: 3" chlorine tabs without CYA

    Quote Originally Posted by mdhwoods
    Ya i follow all that, and actually understand. But you would think someone would figure out a way to get us the best of both worlds. Slow dissolving tablets that do not jack up your pool chemistry . I can wish..
    That would mean developing and testing an entirely new chemical that does not exist and then getting it approved by the EPA.

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    Re: 3" chlorine tabs without CYA

    Good discussion..

    I assume the CYA rise in using pucks takes a long time? I ask because I added several pounds of CYA last year when our liner was changed (new water obviously). I keep two BioGuard smart sticks in ea skimmer at all times. My CYA is still only 30.
    2003 Coleman MAAX Collection Model 706 - 400gal

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    Re: 3" chlorine tabs without CYA

    Quote Originally Posted by jjdurrant
    Good discussion..

    I assume the CYA rise in using pucks takes a long time? I ask because I added several pounds of CYA last year when our liner was changed (new water obviously). I keep two BioGuard smart sticks in ea skimmer at all times. My CYA is still only 30.
    Depends on several factors. You have a sand filter so each time you backwash you are diluting the water. If you had a cartridge filter the CYA would rise faster since you would not be backwashing.
    Bottom line is this. For every 10 ppm FC added by trichlor then you have also added 6 ppm CYA. The chlorine gets consumed but the CYA stays behind so, sooner or later, you WILL have an overstabilized pool! (FC is normally consumed at a rate of 1-2 ppm per day in must pools but it can be as high as 3-4 ppm during the heat of summer and a lot of usage so it's entirely possible for a pool to go from no CYA to too much CYA in one short swim season!)

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    Re: 3" chlorine tabs without CYA

    Quote Originally Posted by waterbear
    Quote Originally Posted by mdhwoods
    Ya i follow all that, and actually understand. But you would think someone would figure out a way to get us the best of both worlds. Slow dissolving tablets that do not jack up your pool chemistry . I can wish..
    That would mean developing and testing an entirely new chemical that does not exist and then getting it approved by the EPA.
    lol but we can go to the moon...
    Kidney shaped ~ 10000 gallon Ig Plaster pool with pool cage. 120sf Cartridge filter. Pentair WhisperFlo WFDS-26, 230 Volt, 7.8/3.0 Amp, 1-1/2 Horsepower 2 speed pump, Solar panels on the roof. Heliotrope HelioMatic 4000D solar controller.

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    spishex's Avatar
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    Re: 3" chlorine tabs without CYA

    Quote Originally Posted by mdhwoods

    lol but we can go to the moon...
    That's it: SPACE TABS!

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    Re: 3" chlorine tabs without CYA

    Quote Originally Posted by spishex
    Quote Originally Posted by mdhwoods

    lol but we can go to the moon...
    That's it: SPACE TABS!
    I can see the slogan now:
    "Space Tabs--The Final Frontier!"

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    Ohm_Boy's Avatar
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    Re: 3" chlorine tabs without CYA

    That's it: SPACE TABS!

    I can see the slogan now:
    "Space Tabs--The Final Frontier!"
    Mmmm... affordable. Maybe Platinum Hypochlorite?
    [center:1kpalu48]Helpful Links: Pool School | CYA/Chlorine Chart | Pool Calculator[/center:1kpalu48]

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    spishex's Avatar
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    Re: 3" chlorine tabs without CYA

    Quote Originally Posted by Ohm_Boy
    That's it: SPACE TABS!

    I can see the slogan now:
    "Space Tabs--The Final Frontier!"
    Mmmm... affordable. Maybe Platinum Hypochlorite?
    I hear platinum hypochlorite combined with diamonds in your sand filter will solve any pool problem.

  15. Back To Top    #15
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    Re: 3" chlorine tabs without CYA

    Quote Originally Posted by spishex
    Quote Originally Posted by Ohm_Boy
    That's it: SPACE TABS!

    I can see the slogan now:
    "Space Tabs--The Final Frontier!"
    Mmmm... affordable. Maybe Platinum Hypochlorite?
    I hear platinum hypochlorite combined with diamonds in your sand filter will solve any pool problem.
    but only in the presence of dilthium crystals

  16. Back To Top    #16

    Re: 3" chlorine tabs without CYA

    Quote Originally Posted by waterbear
    Quote Originally Posted by jjdurrant
    Good discussion..

    I assume the CYA rise in using pucks takes a long time? I ask because I added several pounds of CYA last year when our liner was changed (new water obviously). I keep two BioGuard smart sticks in ea skimmer at all times. My CYA is still only 30.
    Depends on several factors. You have a sand filter so each time you backwash you are diluting the water. If you had a cartridge filter the CYA would rise faster since you would not be backwashing.
    Bottom line is this. For every 10 ppm FC added by trichlor then you have also added 6 ppm CYA. The chlorine gets consumed but the CYA stays behind so, sooner or later, you WILL have an overstabilized pool! (FC is normally consumed at a rate of 1-2 ppm per day in must pools but it can be as high as 3-4 ppm during the heat of summer and a lot of usage so it's entirely possible for a pool to go from no CYA to too much CYA in one short swim season!)
    Thanks. I plan to stick with the smart sticks for at least another year.. keeping a close eye on CYA of course.
    2003 Coleman MAAX Collection Model 706 - 400gal

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    Re: 3" chlorine tabs without CYA

    Quote Originally Posted by jjdurrant View Post
    Thanks. I plan to stick with the smart sticks for at least another year.. keeping a close eye on CYA of course.
    I just read this older thread today because I was wondering why CYA had to be added in a convenient tablet. So, thank you all, especially mdhwoods for the great replies.

    After tiling my black tile in ground spa, I stopped using tables, added a controlled amount of CYA, and I add about a cup of bleach each day, which seems to absorb the sun more compared to when it was a plaster spa. Who knew (?).

    None of the other sanitizing methods mentioned are appropriate for my needs and I would also love the miracle, slow dissolving, not CYA tablet. I would also like beaming technology, as I hate driving.

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    Re: 3" chlorine tabs without CYA

    Just to add to this. Even though its 6 years old...lol

    This is why in late August you usually see the green pools in the neighborhood. It happens every year. June/July everybody's pool is sparkling. Late July/Early Aug, you start to see the water become cloudy, but still decently clear. Late August, the pool stores are packed with ppl complaining about green water. I always knew there had to a reason for this, but until I found this site, I never knew what that reason was. Now it's pretty clear......(no pun intended). Ok, maybe a little....HAHA
    24'x54" 15k AG round - Outback Genesis
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    Re: 3" chlorine tabs without CYA

    Quote Originally Posted by kris77 View Post
    Just to add to this. Even though its 6 years old...lol
    Now it's pretty clear......(no pun intended). Ok, maybe a little....HAHA
    Funny! Just today I asked the local pool dealer about why they didn't carry 3" tablets without CYA. He said "without chlorine?" I said "No, without Cyanuric Acid." He said he thought they could special order them for me.

    Uh hu...

    So yeah, even 6 years later, we all have the same questions.
    14,000 gallons in ground pebbletec built in 2007 with a waterfall feature.

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    stevenmverrill's Avatar
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    Re: 3" chlorine tabs without CYA

    Idea:
    What is the strongest liquid chlorine you can get? (12.5 best I got) if you could find some 30+ you poor in to a 1L bottle pick it 1-10 (or what ever works) times with a needle and then drop it in the chlorinator.

    Bam! Matenence free for 3 days. I need to do this. Otw to see what will fit in my chlorinator

    - - - Updated - - -

    Better yet I could rig a detergent feeder from an old pressure washer in to the plumbing.
    18x36 rectangle built early 90's, 9ft well, "black onyx" vinyl liner, 1 1/2" plumbing, 2 returns, 1 skim, 1 drain/return, plumbed chloranter, 48sf de filter, multi port valve, and 1.5hp jandy pump.

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