I change this every 2 weeks because the filter looks brown and gross with all the dirt it collects. I didn't put them in the canister before because I didn't think they would help, but my water looks significantly cleaner after I started changing them regularly. Plus, they're super cheap.
Humidifier / air purifier "Fanline Aqua VE400" with an ionizer, with a capacity of 410 gr/h
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