There is CEGEP de vieux Montreal that i believe has somewhat salted water because i felt that the water was lighter to be in.. and is 10 feet. At least it did not smell like tone of chlorine. You can go every Thursday night at 9:30 just show up and pay 15$ with your c-card. I should be going next week if my ear infection gets better.
The olympic stadium has the 50 foot pool, but dont believe it is salted.. Never been to that one. I should be going on Feb 21 if I can get someone to come with me. If your interested let me know i got an invite through Plongee CPAS.
I don't think that pool is salted (la piscine du CEGEP du vieux), I was there yesterday to let my friend try my drysuit and it smelled/tasted like good old chlorinated pool water. It can also be a bit crowded (throw in a few OW pool sessions, some refreshes, a bunch of people doing a discover scuba kind of thing in the pool and you got a very crowded pool). It would have been fun to go back to the OS pool but I'm not in Mtl that w-e.