I do use only one gasket, but the gasket size I have been using is not the gasket that has been included in the boxes with most of the filters I have recently bought. For some reason, the gasket sizes I have been getting are incorrect, but occasionally getting the right size so I just keep using it until I see it needs replacement. Of course, I hang onto those that fit, so I have a few. The filter issue is one thing, the other issue is the gasket, but one can always be made.
