Phantom and Mirage on tanks at 1000 ft. Altitude won't affect performance on tanks but is a problem with oxycons if they aren't set up for higher altitudes. Performance for different brands varies, some top out at 7000ft and others got up to a little over 13,000. If you are over 7000 ft you might want to check with the manufacturer to be sure you've got optimum performance.
Robert
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Robert Simmons
(Former) Director for Bead Donations
Beads of Courage, Inc.
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