I had exactly the same problem you had. Last week I bought a 2227 online. I set it up and it worked great, no noise, nothing. The second day I noticed a small puddle under the filter. I took it apart and noticed there was a tiny tiny crack in the bottom of the green plastic canister. Apparently it was damaged in when it got shipped to my house. I had Petsmart send me another which arrived just tonight and I still have the old filter. I set up the new one tonight and I used the same hoses as before, I never disassembled then from the last time. BUT I used a new canister and new impeller head. I plugged it in and this time it seemed it was making a lot more noise then the previous one. It was gurgling and making too much of a vibration noise, especially when it was emptying. I switched the new impeller head with the old impeller head. The old impeller head made a WORLD of difference. I have no idea why. One reason maybe that the old impeller head had at least one night to run and maybe smooth out any kinks on its on. I really don't know though, both impellers were brand new and undamaged. So I guess, try to return the impeller head you have and get a new one....for some reason they aren't all exactly the same.