Genuine Blueair replacement pre-filter in Archipelago Sand for Blue Pure 411 auto; also fits 411 and mini models at a slightly higher noise level (2 dB)

Colorful fabric pre-filter extends the life of the primary filter, catching large particles such as dust, lint, pollen and pet hair

Vacuum the exterior of the fabric pre-filter to remove visible dust and dirt as often as you'd like

Designed for reuse, when the pre-filter requires a deeper clean, wash on a gentle, low-temperature cycle in the washing machine

A hidden compartment in the fabric pre-filter keeps the power cord hidden out of sight

Shipped out the next day !