midland-diving-equipment-88-series-absorbent

Ratings are expressed as a code:The first two characters (letters) designate the typical application for that cartridge or "application indicator"BR = Breathing AirDR = Air/Gas DryingCL = Air/Gas CleaningDD = Air/Gas SweeteningCM = Carbon Monoxide RemovalCD = Carbon Dioxide RemovalND = Inert Gas DryingNG = Natural Gas DryingPA = Particulate RemovalOY = Oxygen The numerical character (digits) designate the performance scale - with a range of 1 to 10 we'll call this the"Performance Rating".1 = Poorest5 = Standard10 = Best