Inline Water Filters

The Frugal Choice:          Camco With Flexible Hose Protector

Cheaper than at Walmart, plus a bonus flex hose protector, which a lot of RVers find very helpful. There's a button you can click on the Amazon page to buy replacements for less than nine dollars each.

Your First Upgrade:         Culligan RV-800

Anecdotal reports suggest these resist freezing and bursting better than the cheaper Camcos. Or maybe it's just a status symbol to let other RVers know you roll with the premium stuff.

The Savvy Sweet Setup:         Essential Systems RV Filtration

The professional grade RV filtration system.