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My daughter showed me sand waterfall/fountains on Youtube recently so I decided to have a crack at making one. Ingredients: 1 mm sand. [ MUST be 1mm ] I used pool filter sand. 25 mm pvc pipe. 2 of 25 mm elbows. 1 airstone. Airpump and 4 mm airline. Half a brain. So I drilled a hole for the airline in the rear of the pvc and a hole in the top elbow to allow air bubbles to escape. Now I need to fine tune it to keep the sand falling directly in front of the bottom elbow otherwise there is no sand at the inlet. I will cut the top elbow shorter to hopefully fix this. To be continued.......maybe