Amazon.com: PUREBURG 3-Pack Replacement Filter Compatible with Blueair 500/ 600 Series SmokeStop Filter, Odor Removal Classic 501, 503, 510, 550E, 555EB, 601, 603, 650E, 505, 605 : Home & Kitchen
LifeSupplyUSA 15 in. x 18 in. x 11 in. Replacement Air Purifier Filters Fit All Blueair 500/600 SmokeStop Air Purifiers (Set of 3) ER006-SS - The Home Depot