The Austin/SA group found a similar product in Lowes called Hapi-Grow Landscapers Mix. It was light and fluffy and mixed well with perlite and soil. By itself it became somewhat hydrophobic if it got too dry (reads: baked on concrete for the month of August).

The only thing about this stuff is that it really needs to be sifted. I put this thru a 3/8 inch screen. The idea of running through a sieve scared me off because I'm lazy. But it's not a bad process- actually goes fairly quickly even for a good size quantity.

In my area the only Hapi-Gro product available is called "Organic Compost" but when I looked it up online it's called compost but the picture supplied says lanscaper mix so I think they may have just renamed it? No soil or perlite in it.

And it just says composted "forest products" so if you're making gritty mix you want to be sure it's pine or fir I believe. But for mixing in with soil & perlite for better drainage I would certainly use the Hapi-Gro over the pine bark and you wouldn't have to screen it.

If you're making gritty or mixing in soil you also want to screen the pine bark twice usually - once 3/8 and once 1/8 otherwise a lot of fines. And did you screen the turface? Turface has so many fines that I end up disposing of probably half a bag every time.

And you probably already know this but turface, bark and soil all hold moisture, and perlite also to some degree. If you need a less retentive mix you might consider using grit instead of turface. See how long your mix stays wet and if it's too much you can always tweak your mix.