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The pond will not crack from cold. It operates just like an ice cube tray
180-300 GPH size pump
44" at the longest and 22" at the widest
no. when full , it will buckle from weight of water . Found out hard way.
Above ground? I don't think it would remain stable, when filled, unless buried upon a layer of sand. It could be raised if a retaining wall was built around it sufficiently strong to hold it and the backing soil.
The liner allows for a pond depth of around 16" at full capacity. The molded lip adds strength and rises an inch and a a half above the surface when set. You'll need to dig a hole at least 2' deep, so that you can add a 6" layer of sand to the bottom of the hole. This allows easy leveling of the pond and excellent support and protection for the liner against any sharp rocks beneath it, when full of water. We love ours.
I don't think the walls are rigid enough to support the weight in very warm weather unless buried. I also don't think that even 3/4" ply would be strong enough to hold all that weight with water in it.
21" is the smallest width on the LP7918
You would need a 180-300 GPH pump for the LP7918