Ok I found the article I mentioned with the math! Hodinkee talks about it here:
https://www.hodinkee.com/articles/se...ths-deep-sixed and here’s the direct link to the math:
http://forums.watchuseek.com/f2/sigh...in-610734.html
I think it should be safe to use a 50m rated watch on a pool, I feel like even if the real rating is for 10% of the stated rating it’s still a good amount more than a regular pool (5m). But like this article states any watch can still fail because of wear so it is a good idea to have it tested every now and then. And at the end of the day it’s your watch and your money so it doesn’t matter what others say, it’s up to you…