Maybe it is hard to demonstrative over video, but I'm disappointed that the video didn't include any actual sand samples before and after.

Are you suggesting that maybe the sand becomes finer after a period of time, perhaps becoming less effective?

While I do like that theory, what I actually meant was, before sand and after sand. They didn't add the sand until 2012 after they did some sound testing. I would just like to hear the difference it made.

I totally over thought that. Picturing you on break sitting at your desk in your white lab coat at some university watching videos on VS trying to calculate the erosion affect of sound and vibration on granules of sand to determine how long it would take before they would have to change the sand again and maybe offer a better quality and grade in the future.

Don't do that man. Although it wasn't your intent, you exposed me as a "duh."