[TAKPAK]

We sanitize the fresh tank once a year, at the beginning of the season. My ratio is to put one cup of bleach (non-scented, non-foaming) into the hose I'm filling the tank with from the house supply. Fill the tank, then turn on pump and run it to each faucet. You can smell it when it reaches each one. Then leave it set for a day or so, then drain and refill. As others, we don't drink from either the fresh tank or the park supply, just bottled water. However, we do sanitize the tank, as we are brushing our teeth and rinsing with the tank/camp water supply. Worked for us for 13 years now.