I use loose salt on the Westside. High humidity or any rain turn the salt pile in to a hard mount pretty much right off the bat. I replenish about every week or two depending on schedule. Elk eat a lot of salt this time of year and will start to taper off come the end of August and early September. Really good way to inventory the animals in the area. The main purpose for the loose salt is we pack it in quite aways and its just easier to carry than a block or a rock, and cheaper.