This was my original Aqua Master I bought new in 1973. In 2010 Bryan did his magic, had it chromed, added a Phoenix, HPR, et al... I dove the s**t out of it for 4 years until I got my Kraken, always taking the hoses off and cans apart for cleaning after each ocean dive trip. Took it for a dive the other day and it just wasn't breathing right. Saw corrosion on the filter and when I took the first stage apart I had definitely gotten seawater inside and it had been there for some time. Spring block was pitted, etc...Just finished a complete Phoenix rebuild (the HPR was in perfect condition). It's back to its great breathing self. Mark