[inquirerofsorts]

> solutions other then HEPA filter

A basic indoor water fountain captures quite a lot of indoor pollution, to the point that it's likely far more energy and cost efficient than pumping air through a disposable filter. There's plenty of research on this.

[guest_guest]

Could you share a source for this?

[strangegecko]

An air purifier with hepa filter will filter the entire air supply in a room within X hours, how is a small water fountain going to pull out particles from elsewhere in the room into the water?