My local Home Depot only had circular trays with casters, and for some reason, I decided the ones I needed should be square. Fortunately, the internet (Amazon) provided me with the exact ones I was looking for and delivered them to me, along with zip ties, two days later.
Over the previous summer, Chad had been making a few comments about the waterfall. It bothered him that you could see the exposed backing from the side. He hated the metal trim that he had put in place to keep the wood from rotting. It annoyed both of us how quickly the well/bucket would run out of water.