@ Canukpool...

I wonder if the canadian soft tubs are okay with the use of bromine tablets because we don't have CYA in it?
( & considering that CYA is banned in two states, perhaps that is why the USA has a different guideline)

or rather, all the bromine products that I have ( powdered flakes & tablet form) don't contain cya ( or salt!)... maybe it's a Canadian thing ( or maybe it's just what is local here in NS)

I would find it interesting to know why the difference between the two countries ( & does Mexico follow the USA or Canadian guidelines for soft tubs?);
Is the actual structual materials of the tubs different?