When my Electrolux handheld bagless vacuum stopped sucking, I called my local shop and paid $50 to have it cleaned and checked. I remembered there was a hepa filter in the vacuum, took it out and it was full of dirt/dust. I ordered this filter, installed it and now the vacuum cleaner works like new. The old one lay there for four years or more. Now I will change this filter two or three times a year to keep the vacuum cleaner working properly. The price is very reasonable.
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