It is very unlikely indeed that the change from 3/4 to 1 inch for that short of a run was the answer. Much more likely is the new filter is not nearly so restrictive to the flow. The old filter was probably either plugged up with fine materials or possibly was just too fine and restrictive.

Most importantly, for whatever reason, you get a good shower now!

[img]/forums/images/icons/smile.gif[/img] Pat [img]/forums/images/icons/smile.gif[/img]