I have a Airvac AV600, S/N L971559 (M&S Systems). We've had it for 5 years. There is a collection of sand/stones on the inside bottom of the bag (about a fist-full). Does this impede performance? Do I have to change the bag. If so, which one? Thanks!
Ron (Princeton, NJ, USA)
Hello Ron, actually the center of these filters is weighed down so the bag lowers to that position when the unit is turned off. It is a good idea to replace the bag every five years or when the machine works better without it (do a test). To remove, pull the top edge toward the center and it flexes and falls out.