OK. Now I understand what it'll be used for.

The lumpiness shouldn't affect what you are doing with it. Once water hits it, it'll get soupy, and what clumps don't break down, you may be able to mechanically break them down. (whack them with the back of a shovel once they're wet.)

www.hoosierpondpros.com

[Linked Image from lh6.ggpht.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).