Tanks must be filled with clean, dry air. For this reason, always make sure you fill your tanks at a reputable scuba shop or resort. These sources maintain their compressors to ensure all oil and water is filtered from the air before it enters your cylinder.

If you smell or taste strange odors in your air, it may be contaminated with oil and should not be used. Immediately report the problem to the shop that filled the tank. Have your cylinder professionally cleaned or inspected before using it again.