On Jan 06, 1998 14:23:28, 'Chris Pitts <cpitts@xxxxxxxxx>' wrote: >John Grogan wrote: >> Your choice of equipment is also important here. For example, if using >> stage bottles, ideally they should be aluminium and not steel (less >> weight). > >I agree. But I've heard that aluminium cylinders deteriorate (corrode) >significantly faster if used with high ppO2 mixes, and so don't last as long. >I also heard that the corrosion can accumulate as loose debris in the >cylinder. > >Is this true, or an old diver's tale? I've heard the same but have not been able to get any concrete evidence. So far, it just seems to be old divers' wives tales. John.