Good filter, but ...

The filter itself is great, but it is important, with which the impeller drive motor it is delivered. In the same drive motors of the manufacturer the impellers in the engine are minimally different from the width. If you catch one motor whose impeller is slightly wider and goes up to the housing stop, then rattles the whole filter and is unbearably loud. Is the impeller minimal shorter, then the filter runs super quiet and does its job excellently.