Mine is a via aqua 300,really quiet except after a clean up.I had noise problems after cleaning,put another impellor in and was louder,then had a look at filter and could see an air bubble half way up,between the bottom and middle basket.I removed the top and taps(read story in thread here),removed the top two baskets,put baskets back,prior had emptied water out.
I read in another filter site to prime by putting water in through the bleed cap/screw on the top of filter,did this and put inlet tap on,turned tap on,waited till water overflowed the filter,replaced bleed screw,turned tap off,fitted outlet tap,turned taps on,then turned power on,no noise.
Sometimes you hear the water/air in the line,I give the filter a slight shake,e.g rock filter slightly side to side,the air pockets dissolve up the outlet pipe sometimes.