Just did my Sonic Venture water system in preparation for out fall camping trip.
I used Clorox bleach.
Added the 2 cups of bleach to the fresh water tank, then filled it completely. This also fills the hot water tank as I drain that tank every winter.
Ran water through all the lines until I smelled the bleach. Let it sit in the lines and tanks overnight.
Next I opened all line drains, and pulled the anode from the hot water heater to drain it.
Flushed the fresh water tank twice, closed all line drains then hooked to city water and flushed all the lines for 5 minutes.
The last thing I did was to mix up 2 gallons of water with a couple of ounces of bleach added and using a funnel, poured that into my 50' fresh water hose, tied the ends together and agitated that around for a couple of minutes, then let that sit for a couple of hours before attaching it to a hose bib and flushing for 5 minutes. NOW I am ready to go camping!