Just getting started on home brewing and I used boiled water in my airlock. I've seen that some places recommend using sanitizer as the airlock "fill". Is it ok to use straight up StarSan in there or should I dilute with water?
What you want in your airlock is something that will:
- Allow airflow only in the direction of lower pressure. This qualifies pretty much any liquid.
- Not have funk grow in it. This means something you could use to sanitize things, or anything with high alcohol content (eg, I use vodka sometimes).
- Not hurt your beer if it ends up getting sucked back down into the fermenter. This means no bleach or other rinse-required sanitizers, and no undiluted no-rinse sanitizers (since they cease to be no-rinse in high-concentrations).
You can starsan, but at in the same level of dilution recommended on the bottle. I usually just save a cup from when I sanitize my equipment on brewday and use a bit of that.