Unfortunately cement will have a hard time sealing leaks - it doesn't expand. I'd give TJ in Nebraska (tj@hudlandmgmt.com) a call about using Soil Flock. You want to put something in the pond that will expand and seal the void With Soil Flock, with the pond at full pool it will follow the water into the cracks and seal it.

Last edited by esshup; 01/30/20 09:55 PM. Reason: added contact info for TJ

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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).