In three words: they work great. We have put cyclone filter model 3 to the test by filtering out dust from milled sheets of MDF. MDF dust is very fine and resembles the particle structure of baking powder. In our test 96% of that fine MDF powder was filtered and did not end up in our vacuum machine. That means that the vacuum bag needs to be changed 25 times less often than without a cyclone filter.
Suppose you have a Bosch AdvanceVac 20 vacuum cleaner and the vacuum bags cost between €2,50 and €4,50 each (depending on the store + shipping costs). When you normally use up one bag a week, with a cyclone filter this is reduced to only one bag every 25 weeks or once every six months (approximately). This means that on a yearly basis you don’t have to buy 52 vacuum bags but only two.
When a vacuum bag costs €2,50 each, then you don’t spend €130 on vacuum bags on an annual basis, but only €5. That will save you €125 year after year. When a vacuum bag costs €4,50 each, it is even a bigger saving of €225 annually.
In addition, it ensures that full suction power is maintained. Also, the vacuum engine does not wear out as fast, because far less dust gets into the vacuum cleaner itself. Your vacuum cleaner will therefore last longer.