OP, having a sediment filter as a minimum is a really good idea, esp. if you have no info. on the water quality or where it comes from at the CG you are at. A filter should not be allowed to freeze (damage), should not be subjected to high temps. (bacterial growth) and filters have a service life (before getting plugged up). What type of filter cartridge and what size is it? It may or may not be doing much good.
Exterior inline filters can be good for sediment but you should read the specs - some have a coarse rating of 100 microns (5-10 would be good). A filter on the outside with carbon (most or all do) removes chlorine which will leave your piping system inside unprotected (use a carbon filter at POU). A filter on the exterior with KDF in it (or sometimes silver) does NOT remove pathogens from the water, it only reduces growth on the filter itself. Some of the RV inline filters don't even have specs available.
If you install a whole house filter housing, you have a wide range of filters and specs. available that you won't ever get in an RV inline filter. A small intro. to RV water quality and filtration:
The RV dilemnaIvylog wrote:
It takes a three stage filter system to guarantee good water... have never seen one installed in a RV. I run water before hooking up and put some in my hand for a taste test. In ten years I've used my inline system maybe three times and we do not buy bottled water.
This is 4-stage filtration I installed after doing extensive research on filtration and water quality around the US. Starts with 63 micron sediment filter, a 5 micron sediment filter, a 1 micron Doulton ceramic cartridge and an "ultrafiltration" cartridge rated down to 0.2 micron. All filters fit nicely under the kitchen sink at the rear and don't interfere with anything.
There is bad drinking water in some locations around the US. When you are travelling around the country, you will likely not know what the water source and quality is and for small systems can be unregulated and untested. Contaminants can include viruses/bacteria.microorgansms, organic/inorganic chemicals, pesticides/herbicides, heavy metals, etc. People who say it's perfectly fine to drink it anywhere you go don't know what they are talking about. I've included a pic of bacterial slime material that showed up on our filter screen in the city water inlet at the CG we spend a lot of time at in Wa., which is supplied from a large public water system. One example of a water quality study (chemicals only):
EWG study