I don't know what they put in it but in Oz that would be classed as expensive. 1.5 cf equals about 36 ltrs and i pay 3.70 for 25ltrs. Granted its a "cheap" mix however after i amend it it comes to about 6 bux for 25 ltr.
I don't think so. The 60 ltr of coir that i add has slow release crap in it though. I try to wash it out as best i can before using, i want control over that aspect.