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Official identifies Trichlor and Hypochlortite in Texas Pool Supply fire
Tri-Chlor or Trichloroisocyanuric Acid comes in three forms. The familiar 3” tablets that slowly dissolve in your pool, a very fine powder shock and a granular form. About 50% of the Tri-Chlor by weight is Conditioner (Cyanuric Acid). So, a 50 lbs. bucket of tablets is about 25 lbs. of Conditioner. If you overuse tablets your pool’s CYA level can go up rapidly. Trichlor tablets are usually 90% to 99% active chlorine. Tri-Chlor tablets have a very low pH of 2-3 so they will lower the pH in your pool. The tablets contain acid in the form of Cyanuric Acid so if one falls into the pool it is likely to stain the surface by burning it.
Tri-Chlor granular is very powerful stuff. It is basically the Tri-Chlor Tablet grounded up in granular form and is 99% active chlorine. Use with extreme caution as the Conditioner in the granular can stain the plaster. The CYA in the tablet is basically acid and if you let it pile up on the pool surface it will stain the plaster as if you dropped a 3” Tablet into the pool. Never add this to the skimmer and if you do use it for Black or Mustard algae make sure it is evenly dispersed on the pool surface. Not for use in Vinyl, Fiberglass or color plaster pools.
The 3” Tri-Chlor tablets must be used and handled in a safe manner to avoid chemical burns and possible breathing issues. If a bucket of tablets were to get water in it, the vapors or gas from these tablets can be extremely overpowering. Make sure to only use a watertight bucket of tablets like these from In The Swim (the brand that appears in the video). Make sure you store the tablets in a safe and dry place and since it is an Oxidizer I don’t recommend storing it in your garage or inside your house.
Pros:
A very strong form of chlorine
Slow dissolving in tablet form so it releases chlorine all week long
Easy to use and affordable
Keeps a good residual chlorine level in your pool all week
Very long shelf life
Cons:
Can stain the pool surface
Contains 50% CYA by weight
Be careful of toxic fumes
https://youtube.com/watch?v=Zeg36eX9nlU