It's driving me nuts. They must have a huge pump and a big drop of water which i can't see through the hedge but it makes one hell of a noise 24/7. We can't open our windows at night, because the noise of water flowing/falling is so loud. TBH, don't even want to go into my garden in the daytime because of this noise. I don't wan't to have a disagreement with my nieighbour but need to get this sorted. All advice gratefully received.