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so my ssi dealer does not rate these very highly, as he says too many people rely on them in their dive. his quote "three breaths and your dead." my opinion is that is three breaths more to attract your dive buddys attention and hopefully get their assistance. if you dont treat it as an alternative air source and just as an emergency option, i think you should be ok. i filled the tank from my regular tank as you are suppose to and i saw about a 400 lb in pressure in my regular tank, which meant that i needed to get that tank topped up. the spare-air full indicator is a little pin that is flush with its enclosure when full. id prefer a gauge. i wanted to know how many breaths i would get (even at sea level). i managed to get between 60 and 70 breaths just sitting around. i know this will reduced once at depth and i intend to experiment with this (dive-buddy present and my own regular air available). i found the regulator a little harder to breath with than my usual, but for what it is: an emergency reserve, i think anything that makes my dive safer cant be bad.
Not much in this DVD that I wasnt taught or is common sense. There is a contradiction in this DVD though. You are suppose to find out you weighting before you dive using a full tank and then it implies to confirm this after your dive. Since the difference weighting can be around 5 lbs due to the air you breathed, how can you still be correctly weighted after (as they demonstrate - at surface exhale and water level should eye-level, inhale and your head is above the water with no air in the BC) both before and after.
These are a great help in getting the wet boots off after a dive and for getting wet boots on for a subsequent dive.