How to Remove HEPA Filter from A Dyson DC18 - YouTube
Dyson Pre-Filters Replacement for Dyson DC18, Compatible with Part 911685-01 (2-Pack) DC18 - The Home Depot
Dyson Slim DC18 Filter Cleaning - Helpful Colin
Dyson DC18 Slim Bagless Upright Vacuum Cleaner Filter Set, Includes Washable & HEPA Filters, Aftermarket Filters to Fit Dyson Part Numbers; 911677-02 & 911685-01 - Walmart.com