Water systems

I'll chime in to say that I "sterilize" my water system once per year at the beginning of the season after I take it out of winter storage. The rest of the time, there's enough chlorine in the city water supplies where we camp to maintain a fresh source. I use 10oz of Clorox and fill the fresh tank...75gals. I turn the pump on and run the water inside at all outlets until I smell the bleach. I let it sit overnight and then drain and flush the next day until there is no more smell. May not be completely necessary, but it's what I do.