In fairness to all, we don't discuss pricing on the Wall. Thanks for your cooperation.
The two main parts of a Filter Drier are ,the Filter part which traps any solids/impurities/debris and the Drier part which catches any water/moisture. When the Filter part does its thing by trapping any "stuff" that was floating around the system the Filter part becomes "plugged" which causes a pressure drop that converts into a temp drop which leads to replacing the F/D. When the Drier part does its thing by holding onto any water/moisture traveling around the system and the Drier is then holding onto as much moisture as it can possibly hold, nothing else happens. There is no more moisture removal, and there is no Pressure/Temperature drop due to the Drier being "full" ,but, the Filter/Drier has to be replaced inorder for the new F/D to remove any remaining moisture.