[sugarloafin']

I have had my Airstream hooked to city water now for about eight months with the fresh water tank about 1/4 full. I was told that I should fill the fresh water tank all the way and add a cup of clorox bleech when the tank it is not to be used for an extended period of time. Is this the proper procedure? Typically, what should be done to the fresh water tank when the water is not to be used for an extended period of time?

Thanks,

Dennis