that's what i used to do. i'm sure a little bit of starsan ended up in the beer but diluted I don't think it matters.
Properly mixed, star San does not hurt beer at all. Especially in the amounts we are discussing for this technique
I was under the impression that StarSan in beer was good for yeast. At least in the levels of dilution that proper usage will provide. Standard StarSan is what, 1 ounce per 5 gallons. A ratio of 640 to one. Considering StarSan foam is almost all air and no liquid, you will get virtually no StarSan in your beer.As for an Autosiphon, I use my lungs and my mouth. But your mouth is a germ farm. Easy way around that. I have a hunk of tubiing, about 3 inches. The ID of my short hunk fits the OD of my racking cane tubing. Put the cane in the beer, put the short hunk on the end of the cane tubing, put you mouth on the open end of the short hunk and start sucking. Once you see the beer coming down the tubing, pull off the short hunk and direct the flow as needed.Keep the short hunk in StarSan during your brew day. It is easier and cheaper than any other procedure I know of.