The filter seems to work just fine in my small, single use, coffee maker. Almost perfect.Problem, not limited to just this brand, is that the filters do not want to separate easily. I only can use a single filter at a time as the coffee maker filters slowly and with two filters, it might overflow a bit. As long as I am careful to only get a single filter, it’s just fine. It is a bit difficult to separate these since they want to stick together . Just be careful and all is well.