CSU – Complete SafeAir User

During this course you will gain basic knowledge and experience to perform dives safely with various SafeAir breathing mixtures from 22% to 50%. You will get to know the advantages brought about by breathing Oxygen enriched Air and the limitations we must consider, when breathing such mixtures. You will also get to know specified equipment for blending, analyzing and marking and labeling equipment for using Oxygen enriched Air/SafeAir. You will learn how to determine the best breathing mix (BestMix) for a specified depth or to determine maximum operating depth (MOD), at which a specific breathing mixture can still be used safely.


Theoretical knowledge:

  • History and evolution of SafeAir
  • SafeAir effects on human body
  • Mathematical basics
  • The Equivalent Air Depth (EAD) formula
  • The depth limit formula (MOD–Maximum Operating Depth)
  • Signs and symptoms of CNS toxicity (CNS–Central Nervous System)
  • Determining the best breathing mixture for a given depth (BestMix)
  • Diving equipment modifications
  • Proper marking and labeling of SafeAir equipment


Practical exercises:

  • Breathing gas analysis
  • Dive planning
  • Two open water dives using SafeAir


Course duration:

3 days

  • Theory: 8–10 hours
  • Exercises and open water dives: 3–4 hours


Candidate prerequisites:

  • Must be 16+ years old
  • AOW certificate or higher
  • At least 10 logged dives
  • Completed medical statement (or a medical certificate not older than one year)
  • Completed liability release and assumption of risk form



Included in the price:

  • ANDI text–Application of Enriched Air Mixtures, ANDI SafeAir table, ANDI Adria decal, a diploma and a certification card, 2 cylinder refills with SafeAir (mixes of 22% to 50%)

Not included in the price:

  • Transportation to locations, equipment rental




You can attend the CSU course as a part of the Advanced Open Water Divers course. The depth limit of the CSU certificate is 40m or depending on the breathing mixture (22%-50%) used. SafeAir dives/practical exercises can be completed at any time in one year from the beginning of the course. It is recommended for both required certification dives to be performed on the same day.  Enrolment is only accepted after prepayment/deposit. In the case of unauthorized absence from the course, there is no return of the deposit.