Posted by NickD (209.83.94.40) on March 15, 2000 at 21:42:00:
Learned today that my medical supplier is using a local welding supplier to fill there tanks, going to pay them a visit and learn how it's done, concerned about oil mist entering the tanks as this oxygen is used for burning and not for breathing. Also watched my concentrator, starting a 20% O2, it hits 44% in one minute and tappers off at 90% in four minutes, I can live with that, takes me a couple of minutes to wash my face and grease my nose, by that time the O2 is well above 55%.