The recommended cleaning period for the Pre-filter is every 2-4 weeks depending on usage.

Odor LED light will appear if the Deodorization filter needs to be replaced.
(Typically every 6 months)

HEPA LED light will appear in the Green True HEPA Filter needs to be replaced.
(Typically every year)

MAKE SURE THE UNIT IS TURNED OFF AND DISCONNECTED FROM THE POWER PLUG BEFORE CLEANING THE PRE-FILTER

The pre-filter can be easily removed without disassembling the product.
Pull the tab at the top of the air purifier to take it out.

Carefully wash or vacuum the pre-filter as needed.
MAKE SURE THE PRE-FILTER IS COMPLETELY DRY BEFORE INSTALLATION

Insert the pre-filter back into its designated slot after drying.