Bissell lift off pet-no suction through base (hose...

I had a similar problem with mine. When you take the collector container out, if you reach your hand up, you will fill a round, plastic piece. Gently turn it and the piece pulls out. On the outside of the piece is a foam filter that may be plugged. There is another filter underneath the collection container in a pull-out drawer. Both filters can be washed with cool water, allowed to dry totally, then replaced. I understand that both of these filters need to be washed "frequently". It worked for me, hope it works for you.