Quote: (Originally Posted by
jaap)
<snip>
I belive that very dry sorb is _very_ dangerous if the user does not perform a long prebreathing (>5min) to moisen the sorb and get a chance to feel if its working OK.
Yes. This statement is very important since one doesn't have the benefit of the activator any longer. It was used up when one starts the canister for the
first time. This is why it is
extremely important to pre-breathe a partially used canister in order to ensure you've given the canister enough time to start the chemical reaction.
Something that has not been stated clearly is the type of diving one does on a partially used canister. While some say don't use it past 24 hours, others say it's ok to use it much, much later (like years...lol) but aren't saying the type of diving they are doing. If one is doing deep, long, or cold dives, it's obvious a fresh fill is in order. Something to the other end of the spectrum can be more accomodating to a partially used canister.