Sept. 9, 2014 - This is the main water line from the pump in the skimmer box to the waterfall. I have a gate valve in line under the valve box that can be used to regulate flow. I sure hope all of those PVC joints are sealed well with the Gorilla PVC cement. It's strange stuff - primer and cement in one. You put a layer on both parts of the joint, wait about 10 seconds, and then coat a second layer. The first layer acts as a primer. It goes on clear and dries white and draws moisture from the air as it's curing. The joints all have water drops on them next day after cementing.