From Amazon
Beurer LR200/210 Filter Replacement Set, 3-Layer Filter System: HEPA Filter H13, Activated Carbon Filter, Pre-filter, Give Your Air Purifier a New Lease of Life, Captures 99.95% of Harmful Particles
OnBuy
10pcs Swimming Pool Filter Sponge Oil Absorbing Sponge Bathing Octopus Filter Cotton
This product is also available at 2 unverified merchants.