Review on 🌀 Filtrete Dirt Devil F1 HEPA Vacuum Filter by 3M by Libby Walker

I have ordered several of these filters. Some of them were sold by Revain and some were sold through Revain by another company like this one. There were also price differences. The ones I bought direct from Revain fit and worked well. The ones I bought from another company didn't fit, didn't seal. They were all from the same brand, the only conclusion I can draw is that there are fake versions of this filter. That could explain the big price difference and also why the same product is sometimes suitable and sometimes not. To put it mildly, I am very unhappy with this situation.