Выпадает поролоновый фильтр пылесоса. Простое и дешёвое решение. Guru from the USSR.

The foam sponge on the HEPA filter either doesn't stay in place, falls off, or doesn't fit properly. I think this is killing the expensive HEPA filter. There's a simple solution that doesn't affect the quality or quantity of air intake, but still keeps the foam sponge in place.