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fresh/salt water weighting....

Thread Status: Hello , There was no answer in this thread for more than 60 days.
It can take a long time to get an up-to-date response or contact with relevant users.

Alun

Well-Known Member
Oct 5, 2001
763
83
118
i've only ever really dived in fresh water, and i may be going away in a couple of weeks to dive in the sea. but i'm not sure about my weighting....

the water will be around 13-14oC. in that sort of temperature i will probably wear a 5mm top and probably 3mm bottoms (maybe 5mm). wearing that in fresh water i would wear a 0.75kg or 1.0kg neckweight depending on the bottoms. i'm guessing about 1.5kg-2kg?? i'll be taking a single neckweight with me, so i want to make sure i take the right amount of weight.

how much should i wear to achieve the same sort of buoyancy in salt water? do you add the same amount of weight regardless of your suit thickness?

alun
 

alastair

Blue Member
Aug 30, 2002
157
33
118
I think you're going to need alot more in the sea than in a lake.

The rule of thumb they use here is 1kg per mm of suit thickness, but I think it depends on the individual's body.

Without a suit or weights I basically sink, so 5kg is too much. I found 4 to be just right.

Take a kilo too much and ditch it once you get there. It's no fun being too boyant.

Al
 

Shadowkiller

Digital Hunter
Jul 30, 2002
1,272
266
0
42
Saltwater has about 10-15% more boyancy than freshwater (dead sea not included) but the amount of salt (and therefore water density) varies with the seasons and from place to place.

I have a 5mm lined suit and I dive with 8-9kg of lead around my waist. That gets me neutral at 5-6m.
 

Bill

Baron of Breathold
Oct 17, 2001
1,805
332
188
81
ballast

I've been working on this for a long time. It gets complicated. If you go from 15C distilled water to 15C average salt water, you need to add 4% of your total weight. If I go from the pool to the ocean, 1% is closer. Salt water density in Hawaii changes with run off and some places (the Med?) are saltier. There are no lakes around here to check but temperature is a big factor. Density changes about 1%/3C.
I like Al's idea about the extra kilo. Too many variables. Will you do the same kind of diving?
Aloha
Bill
 
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