If you use you tank often, (every couple weeks) Just drain and refill with chlorinated house water. Annually or if the tank has set for awhile do a complete sanitize.
RV Tech Library - Sanitizing Your Fresh Water System
FWIW that site has a lot of RV info.
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U.S. Coast Guard retired- 1956-1985
Pensacola, Florida
2016 Siesta 24ST
1972 Moto Guzzi Eldorado
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