The two products are the same in that they are both natural salt deposits mined from the ground. The difference is in where they are mined and the size of the rock. Trophy Rock is mined in Wyoming while the BioLogic product comes from Pakistan. The Trophy Rock is larger (generally in the 14-16 pound range).
Buy U.S. products.lol
Don't let the screen name fool you spikes are made of bone too
The tree of liberty must be refreshed from time to time with the blood of patriots and tyrants. - Thomas Jefferson
The Redmond Rock for equine is similar to Trophy Rock as it is naturally mined in Utah. (it "appears" to be the same thing to me). I saw them at a local TSC but they cost a little more than the TR. The one I saw was $11 for 7lb so about $1.55/lb.
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