I could only find the filter based on the model of the softner. When I recieved the filters they did not match what was in the unit. The filter I removed had plastic ends that looked like they sealed to the nozzles in the unit and it was a folded media like an air filter The new filters did not have any plastic on the ends, and fit loosely on the nozzle, and it was a woven filter. I does seem to be functioning.