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Thread: tri-chloro-s-triazinetrione

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    What is practical difference between Cal-Hypo and tri-chloro-s-triazinetrione? I live in a small town and tri-chloro-s-triazinetrione is more available than Cal-Hypo, in 3" tabs as well as "shock." Note: it says do not mix with Cal-Hypo, how long after applying Cal-Hypo could you use tri-chlor? Could u use tri-chlor 3" tabs in the skimmer after using Cal-Hypo to shock?

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    ajackson's Avatar
    Join Date
    Jul 2012
    Central Ohio

    Re: tri-chloro-s-triazinetrione

    I can not answer your question. However.. I am going to say NO to trichlor tablets.. We have a in ground pool that is 5 years old and I have been using trichlor tabs since it was installed. for the last 2 years I have been having TERRIBLE problems trying to keep the chlorine and ph levels right
    My CYA is now up to 160 because of the trichlor tabs so this weekend we have to dump at least 1/2 our water and replace it with new..

    I am NO expert by any means but after reading and reading and asking a ton of questions and advice on this board I blame all the problems I am having on the CYA. It is just way to high and I cant seem to get enough bleach in the water to keep up..
    Also my liner is really bleached out.
    The thing that makes me more mad is that the pool stores have said my CYA is only 35.. WHAT... 35 and 160 HUGE difference...

    I will NEVER use those evil things again... unless I was willing to replace my water every year.. With the cost of only having 1/2 replaced it is not resonable to think I can put new water in the pool every year.

    If you decide to use them. I sure Hope you have better luck than I did with them.

    Oh.. One more thing.. my Calcium is very high to because of using Calcium shock and filling with well water..
    14500k inground, vinyl, built in 2007
    Hayward Sand Filter, 1hp Hayward pump, AquaCal electric heat pump
    Taylor K 2006

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    Mod Squad jblizzle's Avatar
    Join Date
    May 2010
    Tucson, AZ

    Re: tri-chloro-s-triazinetrione

    Cal-hypo adds calcium with your chlorine
    Tri-chlor (and di-chlor) add cyanuric acid (stabilizer, CYA) with your chlorine.

    Both calcium and CYA can cause problems if the levels get too high. So, neither of them is a good long term solution for adding chlorine .... UNLESS ....
    You are in a climate that requires a lot of water change to winterize or completely drain each year, as that will lower the CH and CYA levels.

    Also, it is never a good idea to put the tablets into the skimmer , especially if you do not run the pump 24/7. Very acidic and harsh on the equipment.

    See: How to Chlorinate Your Pool and other articles in Pool School for more info.
    Jason, TFP Moderator
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    Richard320's Avatar
    Join Date
    Jan 2010
    San Dimas, CA (LA County)

    Re: tri-chloro-s-triazinetrione

    I would imagine that you could alternate between the two as long as they've had enough time to completely dissolve. Overnight, maybe? Don't ever mix the two chemicals together, they can explode.
    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.
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