The larger Oskar humidifier (evaporative humidifier for large rooms) takes four filters, so you will need one 4-pack per change.
Oskar's manufacturer recommends replacing the filters every two months.
Filters help to remove minerals and other contaminates from the water and help keep your humidifier in optimal working condition.
In case you aren't familiar with OSKAR, he's the new cube-shape evaporative humidifier that makes a strong design statement. For rooms up to 400 square feet. You can learn more about Oskar by clicking the link in Related Products.
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