I just heard from a lady at the tack shop this morning that a good way to keep your water tubs from freezing would be to add a small section of a salt block to it. Has anyone ever heard of this before and if it works? I mean I guess it sounds like a good plan the water freezes less and the horses get their salt but I feel like if the water was too salty the horses wouldn't drink it, so how would you know how much to put in? Is this even a valid idea? Just curious cause if it works we might be willing to try it. Also if it is valid would using a mineral bloack do the same thing?