Very interesting reading!
I have installed a 2 cartridge water filter system, and both shore water and water from the pump (fresh water tank) go through these filters. Yes, I did remove them before the cleaning. The filtered water actually tastes pretty good!
In retrospect, I sanitized the system about 2 months ago, but since the camper has been in the back yard, and to save a little money, the water heater has been full, but not hot, with very little flow. Is this why it went skanky on me? Should I keep it drained and bypassed unless I intend to use it? Cold water is used routinely for drinking and toilet flushing.