Since I use a pair of hoses that I keep coiled in a storage bay for fresh water, I pour the bleach down the hose using a measuring cup. This way, the hose, filter, etc are all sanitized as I go through the process. We are not full timers, so the RV sits for a while between trips. I sanitize before every trip to avoid problems. I also have a UV filter under the sink for drinking water.
Hope this helps.