I just found this post by pemelance in a 2017 thread:

Quote Originally Posted by pamelance View Post
I use a food-grade sanitizer called STAR SAN. It's widely used by homebrew/ wine makers. 1 oz: 5 gallons, and it kills E. coli and staph.
I fill up several 5 gal buckets (either outside or in my tub if it's cold out)- swish it around and re-use a few times in other buckets. For taps and tubes, I fill a 5 gallon container, and use a large syringe (60cc- from my vet, once I told them what I wanted it for) to plunge the liquid through tubing and taps. Once air dry, all is sanitized.
I do this twice: once right before (a day or two) tapping and again at the end of the season, before nestling and storing.
I was using a bleach solution like others, but STAR SAN seems safer somehow? Maybe it's the food service background...