I used to have washable AC filters and while they are more expensive they are more cost effective in the long run. I have 2 filters that need to be changed monthly and for around $20 for 2 filters I will pay back the cost of washable filters within 2-3 months. I believe they keep dust etc out of the AC.
NANPU Air Drying System With Double Filters And Pressure Regulator Combo For Clean And Controlled Air Supply
18 Review
NANPU 1/2" NPT Air Drying System - 5 Micron Particulate Filter, 0.01 Micron Coalescing Filter, Air Pressure Regulator Combo - Semi-Auto Drain, Poly Bowl W/Metal Gauge
23 Review
π§ NANPU 1/2" NPT Compressed Air Filter Regulator Combo Piggyback with Auto Drain, 5 Micron Brass Element, Poly Bowl, Metal Bracket, and 0-150 psi Gauge
18 Review
Filter under the sink Aquaphor Favorit ECO silver
20 Review