"Steve" wrote in message
...

I have large external Fluval filters of different vintages, and
Aquaclears. Both can make slight rattly noises, although otherwise they're
great filters.

## There can be air caught in the impeller well. Try tipping the filter to
release it. Also, look at the impeller magnet itself and see if it shows
wear. Hold the filter horizontal and see if that makes a difference.

As noted in another post, the quietest filter I've had was a
within-the-tank Fluval filter. I used a foam sleeve instead of the
disposable cartridge media for this filter, to preserve bacteria and
reduce costs.

## That may be the route you'll have to take.
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