[sofixa]

Until the consumer complains that the air purifier isn't doing its job and thrashes the company online, and changes for a model from a competitors.

Most consumers aren't really capable of this type of nuance.

[ClumsyPilot]

This sounds like a completely made up problem, I don’t think this ever happens.

A clogged filter is obviously full of dust and grime, anyone who can use a vacuum cleaner can understand that