The Blue Camco filter is better than no external filter being used at all. And why anyone would connect to a city water source and not have an external filter "of some kind" in line at the water hose is beyond me..
The sediment filter in any of them.. even the blue cheapo camco will catch most of the crap before it gets into your entire RV water system..
I myself prefer the dual stage filter with a clear filter canister for the 1.0 micron sediment filter and a .5 micron carbon filter for the other one...
This filters the entire water system incoming water before it comes into the RV.. Its as good or better than Brita or any of the other
I buy a pack filter setup that gets me two sediment filters and one carbon filter for about $35.. standard 10" filters. the sediment filter can be washed out a few times to extend its life.
Images of what you get with the Camco blue filter verses a two stage filter... many folks also forget there is a small sediment filter on the water pump from the fresh water tank. I filter that water as well because I don't want to have to crawl in behind the rear access panel and clean or change a plugged up water pump filter....
This link is for a less expensive dual stage filter with 5 micron for sediment and .5 for carbon... I prefer my 1 micron sediment filter and pay a bit more for it..
https://www.amazon.com/Beech-Lane-Ex...35525091&psc=1
The image of my sediment filter after 2 days in an RV park shows what didnt get into my water system.