No reason to junk a car over a botched install, it happens. We've all done stupid sh*t at one time or another. Replace the low side line as Scotty said and call it a day. There is no need for a filter fyi. In fact it may become a source of restriction in the system at some point making the pump work harder than it should have to. Since you replaced everything in the system there should be no junk in it. Just drive and enjoy.