[TAKPAK]

I bought a short (6 foot) length of garden hose to use solely for this purpose. When getting ready to sanitize, I hook up the one end to the convenience center, turn the valve to fill position, then before hooking up the other end I pour the recommended amount of sanitizer/deoderizer, or whatever your choice is into the open end of the hose before hooking up to the source of water. Mixes the solution very well as it heads towards the freshwater tank. Worked for me for many years now.