Just a FYI, not all lump is created equal. BGE provides their own brand of lump, but you may want to take a look here: http://www.nakedwhiz.com/lumprankpoll.htm for some reviews.
That is absolutely the truth. The stuff they sell at Lowes (Cowboy) is horrible IMO. The BGE lump is good but expensive. It is made by Royal Oak. You can find the RO at WalMart for something like $5.77 a bad. It is all I have used for several years.
If you can find it Wicked Good is my favorite, but again it is expensive.