Quote Originally Posted by Phillbo View Post
I've noticed my filter pressure is running lower than normal. Typically the min, pressure I would see is about 12PSI. Currently it's running at about 8PSI. I know a dirty filters causes higher pressure, what causes lower pressure?

I've been trying to track down the source of bubbles in my return lines as well. Could these be related ?
Could be as simple as something gummed up BEFORE it gets to the filter. Your pump may be partly clogged.