Not familiar with that mix...I make all my own mixes, (collection is too big now not to make my own and it gives me more control of how fast it will drain) I haven't used a commercial one in quite a few years and I am not familiar with that wetting agent either. I used to use rock wool cubes in my Phrag mix to hold moisture but I can't find a source for it anymore and all of my Phrags are moving to S/H except maybe walisii and caudatum.