Just an update for you...
The Canadian supply of Purox is manufactured once per year, just before the spring time, and then it's stored... So if you're buying bottles in the end of summer, they're a few months old..

It will still work great though, it just drops down in content.

My father works for Colgate so I've been lucky enough to be getting mine supplied by the employee store, when ever I run low they have to get a few cases brought in from the warehouse because they don't stock it.

Chad