
We use this in an 8 gallon VK811PH HEPA Vac. This vacuum has a $100+ certified HEPA filter. Dust bags, even at $15 each, are worth the money as they protect and extend the life of the HEPA filter. Due to the cost of the HEPA filter, we don't use the vacuum cleaner without one of these bags. We have been using dust bags for several months (in residential areas). With prolonged use of the bags there is no problem with the "musty bag" smell - probably due to the final HEPA filter. Bought a vacuum cleaner for home renovation. We use it as often or even more often than our HEPA-filtered household vacuum cleaner. Nothing seems to come out of the Vacmaster but clean air. .

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