if you were to fill it to the brim, about 13-15 gallons.
The amount of water that can fit in the given cube.
More information is needed in order to answer this question. The size of the pond, preferably in square meters.
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About 18,000 gallons.
Crayfish are very good at getting out, so it's best not to fill a tank to the top.
About 35 pumps I guess. Not positive.
if it's 4 ft deep 21,139.948 gal.