I was wondering if anyone has this problem with their salt they use in their tank. My problem is that it starts to harden up after I open it and start using it. I am seeing this in the 200 gal. buckets. I store mine in the only place I have in a utility closet about 6 ft away from my tank. I do keep the lid on it if anyone is wondering. But this is getting to be a big problem because when I get to the middle of the bucket it gets so hard that I have to chip pieces off. :mad2: