It's a bit louder than expected but nothing crazy and I think the hose is a bit undersized for a 100ft run but it does the job at a good price. Especially if you catch it at the $333 sale price . Only had it a couple days I'll update in the future if there's any major problemsUpdate: after a a month and a half of continuously running in a 1 acre pond. The algea is far worse than previous years without an aerator. Don't really notice the water clarity being any better. The fish (bluegill, crappie, and bass) do seem more active and definitely biting a lot more.