I thought the exact same thing Drewstar,when I saw it too. Why tell someone the obvious,especially when that person is convinced his beliefs are correct,and the only beliefs that matter? grin
Think he uses the foam on top of the water as a selling tactic. It's part of the DAIT insulation,and saves the customer hundreds of dollars a month on their electric bill.
Knowing Jim,he offers his customers a product that increases foam,at a reduced cost to the customer.
Super Duper Foamer,works so well,that you don't need to cover your spa,etc etc