With that 4" trash pump you probably could pump it dry in 2 days of running. (23000 gph)

Will it fill back up? Nothing in ponds (well almost nothing) is 100%. Where does the water come from now that keeps the pond full?

I used a 3" semi-trash pump to pump my pond dry and keep it pumped down so we could renovate it. It worked great. I learned that I needed to float the intake screen from an innertube to keep from sucking up too much sand from the bottom of the pond, which filled up the intake hose.

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3/4 to 1 1/4 ac pond LMB, SMB, PS, BG, RES, CC, YP, Bardello BG, (RBT & Blue Tilapia - seasonal).