Hi Problem With My Filter?

[gonzogonzo]

i have a BIOLIFE filter and theres not a lot of bubbles coming out ,there used to be but not now what do i need to clean thanks

 

[Cazgar]

Try cleaning the impeller.
I have a Flival U3 with Venturi system, & it stops working if the impeller gets gunked up

 

[Hoveringpie]

The impeller give that a good clean and squeeze the pads out in old tank water should be good as new after that.