How high can you pump your deco gas?
My 70' (50%) bottle is pumped to 3,000psi. That gives me more than enough gas to deco out if I loose my 02 bottle- I carry it in an aluminum 80. My 02 bottle was an 80 until this summer when I dumped all of my farce-fins on ebay. That gave me the money to buy an aluminum 40 AND kept me in helium for most of the summer. We cascade our 02 bottles to about 2,000psi. That gives me plenty of gas for my 20' stop.
I also belong to a a tech diving club called DEEPmidwest. We have members from Wisconsin, Ohio, Illinois and even Tennesse. Maybe you would want to start up the Minnesota contingant?
Many of them will be up there next weekend- I heard a rumor of over 25 people next weekend. They usually meet at the North end and there will be a trailer filled with mixing equipment there. My car has all of the freediving bumper stickers on it.
I was hoping to just freedive this time and skip the mixed stuff. Actually I really want to try out my new favorite sport, spearfishing, at Wazee next weekend. I can spend 6-8 hours in the water doing that, compared to the 20-25 minute bottom times we do on mix.
Jon