Wife kept leaving the butter out of fridge.
It was a common recurring problem between my wife and I. I was afraid that butter would spoil if not refrigerated. My wife claimed that her family left butter out at room temperature all the time, one stick at a time but that stick in use could be left out at room temp for days. I did some research and found the Butter Bell Crock mentioned as well as similar products based on the same concept. That natural seal of the water gives me more confidence that the unrefrigerated butter does not become a magnet and culture medium for bacteria yeast and mold.
I recommend this product.