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Message: [QUOTE="vestaviascott, post: 353878, member: 9289"] I don't have any food coloring around the house, so I'll need to remember to get some when I'm at the grocery next. I did fill the pond up this morning and turned the pump off to observe. I could see slight movement of small specs of dust on the top of the water but it only goes around the perimeter of the pond, it does not travel out of the pond at any of the corners like I would expect if there was a leak there. I'm suspecting that the leak or excess evaporation may be related to the upper basin area. Perhaps the fountain is splashing more water than it appears. How long is it safe to leave the pump off in order to be certain the water level remains relatively constant with the pump and waterfall off? [/QUOTE]