For example I cloned many times in the past with just a cloning chamber! and soil mixed with perlite and didn't do well maybe 50/50 but once I got a heating pad for underneath the clone chamber,my success rate went up too! 98% success!.............you cuttings won't root in a cold medium! as fast as they would if there was heat!..........I cloned before in a room tempature medium with bad results you have to get heat underneath that is probably one of the biggest failurs to cloneing...