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How many included
It is a set of 2 filters.
Do you have to wash the filter after every use.
No, the filter is disposable. You should throw it out and replace with a new one depending on how often you use it. If continuously it will last 16-24 hours, around 1 - 2 weeks if it is used occassionally.
Thanks for your question!
How often can you reuse the filters
Continuously for 16-24 hours, around 1 - 2 weeks of occassional use.