How do the in-pool products stay in place on the pool’s ledge?

Our in-pool products are not permanent fixtures; they stay in place due to the weight of the water inside of the product. We stress that specific water depth for each product is important so that the water weight inside the product is heavy enough for the water depth that it sits in. The products will stay in place and won’t bob or float around if they are completely filled with water, and placed in the correct water depth they are designed for.