I usually go with a straight white salt block but I know a lot of guys here are big fans of Trophy Rock. I noticed at the local TSC yesterday they have 30 lb bags of Trophy Rock Four65. Which is basically crushed up trophy rock about the size of pea gravel. Lots of marketing on the bag but to me it appeared someone found a way to market the leftover waste from mining and packaging 12 lb trophy rocks. The price was attractive at $15 for 30lbs vs $15 for a 12 lb solid rock. Anyone ever use it?