: How long can you expose the watch to
: chlorinated water before it becomes too
: dangerous to swim with it?
The seals and gaskets in the watch are made of rubber and in general chlorine in the water attacks the rubber and will eventually cause it to lose elasticity and it will start to crack.
However, it all depends on what kind of swimming you will be doing with the watch. The SMP is a diver's watch rated to a depth of 300m and as such has a very large safety margin if all you're going to be doing with it is swimming in a pool.
The compression that the rubber seals are under when the caseback and crowns are screwed down limits the contact bewtween water and the rubber to a very, very small amount and this, usually only under some decent pressure from going past a certain depth.
To put it simply, when I was in grade school, I went swimming at least twice a week in chlorinated water with a Casio G-shock rated to 200m. At that age, I hadn't started diving yet and having the seals checked annually never occurred to me. The watch stayed on my wrist even in the shower for seven years without ever having been serviced for any reason. (The battery having lasted 2 years past what Casio said it would). Near the end of its life, I took it on a dive to a depth of 50 ft. and it was still watertight. The reason I gave up the watch is that the rubber casing ended up cracking and breaking off. (The strap cracked and broke after about 4-5 years)
