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Thread: What is tri-chlor?

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    Shelley N's Avatar
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    What is tri-chlor?

    Is Tri-chlor: Trichloro-s-Triazinetrione? Any guess as to how many I should use in my 15 x 30 AGP? I got one at HD and plunked it in the skimmer and it looks like it's just sitting there. I've only used BBB so have no experience with this stuff but it sounds like it was just meant for me in this situation. What gets most people into trouble with them?
    Shelley
    Denver, CO

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    Yes, what you wrote is Trichlor. Trichlor is essentially a combination of Cyanuric Acid (CYA) with chlorine. In water, these separate into their two pieces and recombine in exactly the same way as if you had added CYA and chlorine separately to the water. Trichlor is very acidic so it should NOT be used in the skimmer and especially not if the pump ever stops running. I stupidly did that once and it rusted the thermometer in the skimmer and possibly caused damage to my pool heater (and even the pump) when the blast of acid went through the pipes when the pump turned on (I hope it didn't and haven't had problems, but I took a huge risk -- this was all before I learned better from these pool forums and my own investigation into pool water chemistry).

    Generally, if Trichlor is used, it is put into a floating dispenser which has it slowly dissolve. It can also used in an inline feeder.

    The main downside to Trichlor, other than its acidity, is that it adds CYA to the pool and CYA is not something that breaks down (normally) in pool water. So it continues to build up UNLESS you have significant splash-out, backwashing (if you have a sand filter or regularly clean your DE filter) or have lots of rain that overflows and dilutes your water. Otherwise, you would have to regularly drain and refill part of your pool water to keep the CYA level relatively constant.

    I would only use Trichlor if your CYA is a little low and you want to increase it. Right now in my own pool I'm using Trichlor just for that purpose, but when I get to my desired level (20 ppm CYA for my pool since I have a pool cover that keeps out the sun most of the time), I will switch to chlorinating liquid (regular bleach would be OK, too).
    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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    NWMNMom's Avatar
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    Tri-chlor

    Also, please note that a lot of the mfg have starting adding copper to the tri-chlor pucks/sticks/tabs - this is what makes hair turn green
    18x33x52 Buttressfree Seaspray (Wilbar) AGP - 1.5hp Pentair Maxim w/22" Pentair Meteor Sand Filter, Aqua Rite SWG System, Biltmore Walk In Steps - 2/4x20 Solar Panel Setup - Doheny Jet Drive (RIP -Pool Rover Jr) - finally hard plumbed the whole darned thing -
    Beats Driving to the Lake!

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    Shelley N's Avatar
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    Oh NO! I see that the one I bought at WM has 1.5% of copper sulfate pentahydrate. I have no idea if the one I bought at HD had that in it as the wrapper is long gone. It isn't dissolved yet, so I will run out and get it. I was hoping to lower PH, add CYA and add chlorine all in one fell swoop. I knew it sounded too good to be true.
    Shelley
    Denver, CO

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    Shelley N's Avatar
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    Found the wrapper for the Pool Time brand tablet I purchased at HD, called the 800# and it does NOT contain any copper at all! Guess I don't have to go in after it. I do have to get it out of the skimmer however.
    Shelley
    Denver, CO

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