The only sand that will truly work is the pure white sandbar sand from the lower Mississippi river! Seriously, the "sharp" sand that brick masons use or the sand you can get in bags, not always the bulk, at yard and garden stores is fine. The sand needs to be very dry before attempting to get it into most of the bags I have had.
HTH Hank
[This message has been edited by HankL (edited March 08, 2000).]