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Message: [QUOTE="addy1, post: 418175, member: 2547"] Mine stays full of water, it does drop a bit below the gravel level. But not much. I think if the water goes that far below the plants they will die. The gravel will dry out. Mine freezes up hard. I have mine built so it can not drain back down. The input line is above the level of the pea gravel, or right about equal to the level. Then it goes down to the manifold level. I turn all off for the winter, my pump is external. Open the lines, leave any water in them that is there, pull the pump and so far, 9 years now, have not loss any pipes. My pond is build on a slope so it was easy to build it this way without a lot of lines sticking up. The down slope side of the bog is a 8 foot berm of dirt built to make the land level. [/QUOTE]