Sanitizing your RV tank effectively will require a bleach solution. You’ll need to add a ¼ cup of bleach for every 16 gallons of water within your freshwater RV tank. This measurement will equal one ounce of bleach per eight gallons. But please don’t add the bleach right into your freshwater tank. It needs to be diluted first with a gallon of water for each ¼ cup of bleach. The bleach will be a little too potent and render your freshwater tank unusable without it. Experts recommend sanitizing your RV’s water tank at least every six months.
