2 Packs Pre-Filter Replacement Cover Compatible with Blue Pure 511i Max Air Purifi-er, Washable Fabric Pre Filter

Perfectly Compatible with 511i MaxThese replacement filters are only compatible with Blue Pure 511i Max Air Purifi-er. Not fit for other models. Please check your model before placing an order. | Easy to InstallSimply take off the older and dirty fabric pre-filter and replace it with a new one. Vacuum the fabric or toss it in the washing machine whenever it needs cleaning. | Value for MoneyIncluing 2 packs high quality pre-filters at low cost for long time usage | First Line of DefenseOur cover is the outermost layer of your machine and effectively trap larger particles such as pet dander, hair and lint, extending the life of the inner filter | Warm TipWe recommend to replace the pre-filter every 3-6 months depending on using frequency