Even a cheap filter is like 10$ and more over cool mist one`s are prone to microbial and bacterial growth. so its recommend you change them every season of use or 3 months once.
i uses a vicks one with the filter made of paper so cleaning is out of the question.I pick up a new one for 9$ from cvs.
First answer by Silverfz. Last edit by Silverfz. Contributor trust: 11 [recommend contributor]. Question popularity: 15 [recommend question]
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