I have a Hoover wind tunnel vacuum that I bought in 2011. I knew the sponge filter and washed it regularly. The suction power seemed to diminish over the years. Then I found out where the HEPA filter is. This set is ideal for this vacuum cleaner model. My HEPA filter was very dirty and clogged. It needs to be replaced. When I did this, the suction improved to the level it had when I bought the vacuum.
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