I installed a course in public water about 10 years ago. Went through the effort to get the permit done. First year we used a portable course...which was OK. The next year I built a course using a stainless mainline and SCH 40 PVC. The balls are attached to the PVC with surgical tube zip ties. The balls are filled halfway with water so the tube ropes glide over them. The course is going on ten years now. The only issue we have had is some issues with anchor hardware breaking last year. Make sure you GPS your anchor locations. If you put the effort into it, you can have a course that will stand up to boat traffic. In all honesty, it is more durable than the course we have on a private lake.