Personally, I would NOT do a main drain on an AG pool, especially if in a frost zone - you would not believe the amount of movement an AG pool undergoes due to frost and that center drain will only become a problem spot. It's realatively easy to slope your ground inside the pool to be about 6" deeper in the middle, when setting your return jet to create a vortex, most dirt will accumulate in the center portion of your pool anyways and vacuuming that up really takes no time at all.
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