I full time and I sanitize my fresh tank once a year and filter all water that comes in with a two stage filter. The first stage is a particulate filter and the second is a charcoal. Both filters are 1 micron. The particulate filter usually lasts 6 months on my home base site and two weeks in the state park where I am now. The charcoal filter usually lasts 9-10 months, but both filters virtually plugged up this past week at the same time. The park had a water main leak and when they turned the water back on some crud obviously hit my filters. I turned on the water hose I use for car washing, etc. and ran it on the ground for 45 minutes or so. Changed both filters and everything was good again.
I didn't know the leak was being repaired or that they had turned off the water until after the filter plugging. I was out of the park, but I'm sure glad I had the filters in place.
I do not use bottled water at all. I feel both 1 micron filters work well and the water always tastes good to me.
2006 GMC 2500HD CCSB 4x4 Duramax/Allison, Titan 52 gallon fuel tank, Prodigy Controller, B&W Companion Hitch
2010 Jayco Designer 35RLTS, Cummins/Onan RV QG 5500 EVAP, Progressive Industries EMS-PT50C, TST Systems 507 TPMS, RV Flex Armor Roof