Let me start the article with stating what you are about to read is NOT a substitute for training from a certified Enriched Air Instructor. What you read here compliments that instruction. It may be used to prep before you participate in instruction or as a refresher. Enriched Air Certification is earned only through a certified Enriched Air Instructor. Do Not attempt to dive Nitrox without being certified. If you are interested in becoming Enriched … Read entire article »