7 years and we never used a filter or regulator! We also don't drink campground water, it's for washing and flushing only!

We use a pressure regulator. Most regulators are preset to a specific pressure, I cant recall what the preset is. We haven't ever used a filter but we only use the CG water to wash and flush as others have stated.

[quote author=GA Judy link=topic=3210.msg31400#msg31400 date=1419373647]
We use both a pressure regulator and a water filter that has a changeable filter (and we change that each year). You can never tell what kind of water pressure you will encounter the more places you visit, so a regulator will save you headaches and damages in the long run. We've also had some questionable water a couple of places and have always had good results with the filter. A 90 degree angle water connector is handy to have as well to hook your hose to the camper - less strain on the hose.

We use the same setup as GA Judy mentioned - including the 90 degree angle connector.

We have always used a water pressure regulator on our rv's.  It is cheap insurance for an unexpected high water pressure.  They are usually set to 40 to 50 psi.  Most municipal systems are around 50 psi.
For more info see here: rv water pressure regulator
Good luck and happy camping.