The thing to check first is the shaft the impeller runs on. being new it shouldn't show any wear. Check the hole through the impeller to se that it is round and in the centre. if either of these aren't right the filter will be noisy . If the shaft isn't in straight that will also make it noisy. I have some that are over 20 years old that are still quiet. If you are using sand, check the inside of the motor cavity and the inside of the impeller. Sometimes the impeller magnet will grab a grain of metal in the sand and hold it. It may be difficult to see, but if there will cause the impeller to run off centre.
All the smaller ACs use the same motor so the impellers can be swapped from one to the other, making the filters even more versatile. The only one that is different is the AC110.
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