i have been using perlite to do my clones since the beginning of the year, lately i have stopped using any kind of rooting hormone and still sometimes achieving 100% success rate
i add only liquid kelp extract to the water that i use to wet the perlite. the beauty of the system is that the medium (perlite) costs nothing because after the clones come out it gets mixed into the soil, i was using rockwool cubes before this, expensive,time consuming and itchy... if anybody is interested in a step by step explanation speak up and i will be glad to help