There are but a few things in life, that every time I think of them, they make me smile. Like my Vice-Grips that say "Made in U.S.A.". My Aero-Stream is one of them. I will have mine 3 years in 2 months from now., in late December, when 3 yrs. ago I was chopping at the perma-frost for my usual 6 month emergency cleaning. Since I installed my Aero-Stream, no more, but will make my first appointment in the spring for my first tank cleaning in 3 yrs. In the beginning, I would monitor my tanks progression (I drilled a hole in my tank lid and glued a short copper pipe I keep capped and measure with a dip stick.) But shortly before the 1st year I noticed the tank was always at a minimum, no matter what. This thing works! :-)