[cwkoss]

I've always wondered if you could essentially hook a blower up to a bong to filter particulates out of the air using water. Would be much cheaper to replace the 'filter', but I suspect it wouldn't filter as well. Seems like it could be an interesting tradeoff though.

[dredmorbius]

There is a set of "Luftwascher" ("Air washer") designs which effectively do this.

These do filter out particulates, but also add enough humidity to the air that this is billed as a feature of the system. In high-humidity conditions this is less than ideal.

https://venta-usa.com/product-category/airwashers/