Ascholten
Free Ranging
Need sand for the Cacklers? Well you are in Michigan. Plenty of beach front property to get that at!! Go spend the weekend at Mt. Baldy and take home a few 5 gallon buckets 
Seriously though, instead of trying to dig some up and wonder whats in it, you can get it real cheap at any hardware store, well maybe not cheap, pool store, construction supply company. Nursery or landscaping places should have some, plenty of places. Hell, just come visit me in Jacksonville Florida, and dig 1/ 16th of an inch under my sod, it's what the $%$ developer left me as 'lawn dirt'
I'll even cook you a steak and give you some good coffee for the trip back.
More seriously though, if you just need a few pounds, pool supply store should have some fairly pure stuff they use in pool filters, or Lowes, Home Depot, etc in bags. Otherwise numerous wholesale places... not counting beaches and free sources of course.
Aaron

Seriously though, instead of trying to dig some up and wonder whats in it, you can get it real cheap at any hardware store, well maybe not cheap, pool store, construction supply company. Nursery or landscaping places should have some, plenty of places. Hell, just come visit me in Jacksonville Florida, and dig 1/ 16th of an inch under my sod, it's what the $%$ developer left me as 'lawn dirt'

More seriously though, if you just need a few pounds, pool supply store should have some fairly pure stuff they use in pool filters, or Lowes, Home Depot, etc in bags. Otherwise numerous wholesale places... not counting beaches and free sources of course.
Aaron