Quote: (Originally Posted by
ardhill)

I appreciate all the replies.
So, there are ways and means without getting too complicated and most importantly for me, the units I am most interested in can all do 100m without much fuss.
Thanks
.
The official answer is to dive within the limits of the unit's manufacturer. The fact the Rebreather World is loaded with homebuilders, designers and adventurers who pushed beyond what is considered reasonable limits. Many are here to enlighten us with their stories others alas are no longer with us but we learn something from each.
Play smart and play safe and I am sure you will get to where you want to go soon.