I hadn’t ever tried stacking a polorizer and a neutral density filter to get the smooth water, but it worked well here even for being almost noon with little cloud coverage. In the past I had always shot in lower light (like at sunset)with long exposures which works but you run the risk of the other areas in the shot not being as sharp because of slight movements. Another benefit to doing it this way and at this time of the day is you don’t have to fight with bugs as much!