We use a pur faucet filter on the galley sink. The filter came with several adapters that enable quick on/off connections to different faucets. One of the adapters fit the house and another fit the camper. We just transfer the filter between the two when we are home or away. As to the camper holding tank I sanitize it at the beginning of the season with household bleach. I flush the holding tank after sanitizing it but the filter removes the chlorine anyway. This system has worked well for us because the filter can be turned on or off depending on whether or not we actually need filtered water.