The plastic ring on the 1st pre-filter came loose causing the filter bag to clump up after being sucked into the bottom of the canister tunnel. The vacuum cleaner lost suction and after checking the hoses and brushes, the dirty filter had to be fished out of the canister. I thought it was an accident and an isolated incident. But with the next pre-filter, the side seam came loose, which in turn led to a loss of suction. Then the post filter exploded and the air cleaner started spewing out a cloud of dust before I realized it and turned off the air cleaner. Part of the pleated filter material had separated from the plastic frame and was sticking out through the ribs. Then the last pre-filter also separated from the plastic ring. As they can be washed and reused this was a waste of money. They should have been with me for most of my life. But due to the fact that they turned out to be disposable (I didn't even have time to use them for washing), the price for them is completely overpriced. I will not buy from this seller again.