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I am always presuming we are talking CCR diving. 1.3 is the standard CCR high setpoint P02 but I am sure there are guys who deviate from that.
At a P02 of 1.6 one is going to be getting constant 02 injection from 20 feet and shallower so we always switch to the low setpoint above 40 or so feet.
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For PSAI/SSI/SDI/TDI Diver Training or RHIB Charter in Cornwall visit - Atlantic Scuba