I've had a small koi pond in my backyard for almost 40 years and must have gone through ove a dozen air pumps. Most all of them where mid-to-high end aquarium pumps with 2 diaphrams that were designed for outdoor use. They all required maintenence or replacement yearly. This thing is a lot quiter than I expected (no louder than what I had) and it puts out enough air to blow through 6 air stones with more to spare. It might be too early to judge it's longevity but so far I'm really impressed.
Ka Thao 
