Hydro is the mechanical inspection that is required every 5 years for 15 to keep a SCBA tank legal to fill, then there is an additional test (MAE) required to extend the life from 15-30 years with continued SCBA every 5 years.We all have different situations - mine; I shoot right out my back door and if I wanted different surroundings my rifle club is less than 5 miles away - with a 6.8L and 9L tank air is not an issue. I do not know what hydo is but there is zero maintenance other than the schedule which is a long way off.
So no, there is NOT zero maintenance on tanks.
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