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Watching with interest as I have just made a small solar powered water feature. I wanted to replicate a natural spring with a gentle trickle of water falling over plum slate. I sank a 40litre box and placed a grid over it made from two fridge shelves. The slate is arranged to allow the water to return to the reservoir and to hide the white shelves (bad choice but upcycled so free).One annoying issue was maintaining the water level as there is (I think) a small leak somewhere in the upper pool/splash pool area which defies precise detection. That together with evaporation meant topping up was required at least once a week.