proper mix of chlorine or bleach for water tank

Winnebago recommends 1 teaspoon per 10 gallons to keep it sanitized thereafter when filling it. We do that and have had great results. We do have a filter under the sink that removes any chlorox smell from cold water. Doing that I don't worry much about the white hose. I do spray the spigot we fill from as well as the connection on the RV with lysol. I don't remember the initial sanitizing formula, but 1/4 cup sounds about right which I do every spring after dewinterizing.