Water research for RVs

I usually sanitize my 90-gallon water tank once a year. I don't mind using my onboard water supply for drinking as my filter is (this is a copy and paste) "granular activated carbon filter that reduces bad taste and odor of chlorine as well as bacteria, viruses, cysts, asbestos, mold, algae, sediment, dirt, rust, limescale, sand, silt, and other common impurities. The Everpure EV959206 is also enhanced with bacteriostatic media to limit the passage of bacteria that may already exist in the incoming water plus inhibit the growth of bacteria within the filter". Most of the time, I use bottled water and use my onboard water for washing, bathing, etc.

After my water is gray or black, I will dump into a park septic or my home septic. I also spray clean the inside of my black tank about once a year.