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What filter does a Levoit Classic 300S take?

None — this model has no replaceable wick or filter.

Levoit Classic 300S, ultrasonic humidifier, tabletop.

The Levoit Classic 300S has no required replaceable wick or filter. Optional aroma pads sit in the aroma tray; they are a fragrance accessory, not a filter.

Finding the model number on a Levoit

Levoit ultrasonic models (LV600HH, Classic 300S) have no required replaceable filter. Model number is on the bottom label.

This entry exists so the answer is complete: if a store tries to sell you a replacement filter for this model, it is not a manufacturer part.