You want something that will compact the clay, but not damage the pipe. Jumping jack compactors (I don't know what they're really called), they're a motorized pogo stick without the foot pegs.


www.hoosierpondpros.com


http://www.pondboss.com/subscribe.asp?c=4
3/4 to 1 1/4 ac pond LMB, SMB, PS, BG, RES, CC, YP, Bardello BG, (RBT & Blue Tilapia - seasonal).