With our HTT and then TT we never thought about it...used the CG water and lived through it, so guess it was fine. We did (I say "did" since we're trailerless) always sanitize in the spring and any time we felt like it needed it. Sometimes mid summer, but that was about all. Our trailers had the system filters and we added a Pur faucet mount. Strong feelings about bottled products and the environment, so rarely bought any. If we did, it was either a 1 gallon bottle or one of the larger containers with a spigot....very rare occasions.