You should sanitize your water system at least once a year. I use the chlorine method. 1/4 cup of chlorine per 15 gallons of fresh water in the fresh water tank. Run the hot and cold at each location until the bleach is scented at the faucets. Let stand for 3 hours. Drain and rinse.
Mike, RVIA & RVSA Certified Master RV Technician
Amy, Dr. Assistant - Roxie & Mei Ling, four legs each
2000 Gulf Stream Scenic Cruiser 450 hp & 1330# torque
06 Saturn Vue, 06 Chevy Z71 4x4 & 2014 Corvette Z51 M7