You guys that have used them.Have you noticed a soil preferance,such as topsoil,over say muddy swamp,sandy,or clay soil?Also,how long does it generally take for them to notice it?Thanks in advance.

On just about all of the mineral type attractants I have found a somewhat fertile soil with good drainage to be a key ingredient to the effectiveness of the product.

I use the regular cattle strace mineral salt blocks. Usally deer hang around
the bottoms of a property.

a buddy of mine used them a few years ago and they were a huge hit.