Hey Dave, I believe you. And, no offense, but I like Dorans answer better;-) The first time I heard it I thought it was something lawn elves brewed up when no body was lookin'. Clay On Sunday, March 1, 2009, at 12:00 PM, gsas-member-request@thekrib.com wrote: > Alfagrog is a pond filtration media that looks like small lava > rock balls or chunks. > dave _______________________________________________ GSAS-Member mailing list GSAS-Member@thekrib.com http://lists.thekrib.com/mailman/listinfo/gsas-member