I have just recently converted to Starsan for my sanitizing needs and was wondering if this strategy would work to conserve Starsan:
1. Mix up 5 gallons of Starsan solution and use to sanitize equipment, utensils, and primary fermenter (6.5 gal. carboy) on brew day.
2. Pour the 5 gallons of Starsan solution out of the primary fermenter and into the secondary fermenter (5 gal. carboy) and seal secondary fermenter with plug.
3. When it's time to rack the beer to the secondary, pour the Starsan solution into the keg... let sit for several minutes and then push the solution through the beer line to sanitize the line.
4. Rack beer into keg, pressurize, etc.
My question is if the Starsan will stay effective through this entire process or if will go bad after a certain amount of time. I read somewhere that if Starsan is sealed off from the air it will remain effective, so I was hoping that if I stored it in the sealed secondary fermenter it would be OK.
I appreciate your input.