During this aerator cleaning process, we made a common, yet preventable mistake. We failed to cover the drain hole in the sink. According to Murphy's Law, if anything can go wrong, it will. In this case, the flow restrictor fell and slid straight down the drain! Notice the shiny package containing a brand new aerator? Because of this avoidable mistake, we had to go down to the hardware store and buy a new aerator. Though the replacement cost less than $5 with tax, it did require a special trip and who wants to spend money fixing a dumb mistake? Avoid this problem when you clean your aerators by covering the drain hole with a washcloth.