This fit my FP-A80U perfectly and seems to do very well at filtering medium and small particles. It is a little expensive in my book but I can't really find it for any cheaper,
Vacuum cleaner Deerma DX118C RU, white/grey
144 Review
iRobot Roomba 692: Smart Robot Vacuum with Wi-Fi, π€ Alexa Compatibility, and Pet-Friendly Features for Effortless Cleaning on Any Surface
138 Review
Xiaomi Mi Robot Vacuum-Mop Essential Robot Vacuum Cleaner, white
284 Review
Vacuum cleaner Deerma DX700, white
240 Review