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Also, how much is CYA in Trichlor puck?
Since for every 1 ppm FC from Trichlor you get 0.6 ppm CYA, Just adding 2 ppm FC per day of chlorine from Trichlor over 5 months is 180 ppm CYA. 70,000 liters is about 18,500 gallons and one 3" puck, if it's an 8-ounce puck (some are 7 or 6) adds 3.0 ppm FC and 1.8 ppm CYA every 2 days.
Hereof, how much cyanuric acid is in Trichlor?
Trichlor contains 54% cyanuric acid.
Cal hypo is the most powerful type of pool shock, making it great for super-chlorination. Calcium hypochlorite does not contain any cyanuric acid (CYA), therefore it will not raise the CYA level in your pool. Power Powder Plus is safe for all pool types, but may cause bleaching on certain surfaces.