So simply evaluating by each of their weight works? I thought it might be more complex in light of the way I've heard 'Tri-Chlor' described as one molecule or something... Thought that it might be more complicated than just comparing weight, utilizing the FC/CYA ratio of the tabs, that maybe the tabs are more condensed/concentrate... No?Depending on where you purchase CYA, it can be $2-$5 per pound. Trichlor is about 33% CYA. Most pucks cost about $2.50 to $3.00 a piece (8 oz) (unless you buy the monster tubs). So it is much cheaper to use CYA/stabilizer.