how much CYA will a 50lbs of tri clor add?

[aquarium]

I'm probably wrong here, but I -think- adding 50 pounds of Trichlor will add about 25 pounds of CYA. Then you could just use the dilution table on the back of the container of pure CYA at the store to figure out how that affects your own pool.

[chem geek]

That's pretty darn close. 50 pounds of Trichlor is equivalent to 27.8 pounds of CYA in terms of its CYA content (i.e. these stated amounts both raise the CYA by the same amount) -- 332.8 ppm CYA in 10,000 gallons -- obviously way more than anyone would want.

[aquarium]

Yeah, I rounded off. I asked DuPont about this last year and they said each puck was 56% CYA. 50 pounds times 56% is 28 pounds.