Originally Posted by
Summit
silica is neat but again with the keeping it fresh (do we keep adding valves)
and for the purge valves (however you want to do it, mushroom or diaphram /w mushroom or whatever) the better you make the seal, the more you have to sorry about maintainence (make sure nothing is in there, no grit prventing the mushroom from closing, maintinence checks to make sure a diaphram isnt checking) OTOH you can make them for good long times between maintainence. the question is how long can you keep an unsealed scrubber reasonably fresh in the system? 6 months?
two other issues:
1. valves need to fail safe (open)
2. the avalung is encouraged to be breathed through while skiing through dangerous areas, not just when trapped, so that the mouthpiece is always in incase of a problem.
3. 2 combined with the filter life means the filter must be easily replacable by the user or a shope tech so that the user doesnt have to send the reavalung back to the factory
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