heres a quick write up on my thoughts of the JJ-CCR and SF2 Rebreather for anyone interested
http://tech-ccr.blogspot.co.uk/2015/11/jj-ccr-vs-sf2-eccr-rebreather-comparison.html
Cheers
http://tech-ccr.blogspot.co.uk/2015/11/jj-ccr-vs-sf2-eccr-rebreather-comparison.html
Cheers