GRIM REEFER. i believe it does contain perlite. and needs no help with drainage. my pots drain in llike 5 secs.
also they say, u dont need to fertilize plants for 30 days :} And I didnt and mine grew pretty good. towards the end of veg, i gave them minor ammounts of ferts, but they really didnt need em.

heres a link to ingrediants i think
http://homeharvest.com/pottingmixprefertilized.htm