Jeff,
It is very close to the Orchid mix that I use aslo. I use Fir bark (sm.), Grit #2 & Pumice. Could use Perlite or Diatomite in replace probably.
Rick
"Many times a day I realize how much my own outer and inner life is built upon the labors of my fellow men, both living and dead, and how earnestly I must exert myself in order to give in return as much as I received"