Can't get the filter to stay up inside the cannister
This may seem obvious, but do you still have the retainer for the filter? I'm not sure how old your unit is, but in the newer ones there should be a black piece (the retainer) that pushes in to the cylinder that the filter slips over. You should push this piece up until it stops, and then turn it so that it locks in place. I have had people throw this piece out by accident when they empty the container.
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