I looked up the Better Gro Phalaenopsis Mix and it sounds similar. I found an image that shows the back of the bag as clear. The ingredients it lists are: Canadian chunk peat, western fir bark, hardwood charcoal, and coarse perlite. Do you think this might be the same thing?
That sounds about right! The peat will retain water for a little while, but it won't keep your plant too wet like the other mix will.