I've been wondering this as well, wondering if it's really necessary. Getting a little tired of wasting the CO2, opening and closing my kegs to refill with BLC, then StarSan...my process seems to be working fine, but if I don't need to run StarSan after BLC, then I don't want to bother with it. The instructions on the BLC bottle say to rinse with clean water, I think. So I run BLC, then water, then StarSan through. So if I can cut down on something there, I'd love to.