well, it depends- are you doing line dives (deeper than 30 feet) if so- you'll only need about 8 or 10 lbs. if you are doing less than 30 feet- you'll want more just so you don't have to fight to go down. When I'm spearfishing in shallow water 15' or less i use 20# and that still keeps me positive. This is some info. I'm sure others will chime in.
When I do line dives I use 8lbs in fresh water and 10lbs in Salt. I'm 5'11" and 200lbs.
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