kiss valve / needle valves

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How do you calculate your duration? Believe me I am not knocking you, we cater to the homebuilder, but as a business we have to back up whatever we say with hard data.
 
I did it once using the dive sorb small grain. cannister sealed when not in use. two days of diving, 6 dives. was closer to 5.5 hours.
This is where I should say that I have experience with what a CO2 hit feels like and how to respond when it happens. My normal usage is large grain 3 hours, then thow it away cause that's the end of the day.
 

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