Several things to try:
Clean the INSIDE of the intake tube with a pipe brush.
Check the filter cartridge and replace or clean if needed.
Check the bearings on the bio wheel shafts , clean them off.
See if the wheel is sitting properly on the filter.
Give it a good once over and clean everything and restart.
Tom
Clean the INSIDE of the intake tube with a pipe brush.
Check the filter cartridge and replace or clean if needed.
Check the bearings on the bio wheel shafts , clean them off.
See if the wheel is sitting properly on the filter.
Give it a good once over and clean everything and restart.
Tom