fresh to salt weight conversion

[DetectorGuy]

last week when I was in the cenotes the divemaster told us to use half the weight in the fresh water cenotes when compared to diving in saltwater. This is assuming that you have the same thermal protection and gear set-up for both. This "half/twice" theory worked pretty close for me, but then if you ask anyone that has dove with me in the past, they will tell you that I am not a good one to talk to about weight.