I knotched the lid of my pot for my immersion chiller. I usually santized the lid with star-san from a spray bottle. But for over a year, I've left the lid off while I chill. I have a huge immersion chiller and have no desire to concern myself with pumps and counterflow chiller etc...If you pitch the proper size starter, make sure your carboy/bucket/line is sanitized and oxygenate your wort at pitching, I think your pretty much in the clear from infection. Giving your yeasties a headstart on anything that might fall in your beer is the key. I've had bugs, cobwebs, etc...fall in my wort with no ill effects. Relax......
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