Im gonna give all you guys a secret.....Im sure any cloning gel/powder works good, but I use clonex, AN sensi A&B, and last but not least home and garden roots excelurator. I dip the rockwool into a premixed solution of sensi AB and roots excelurator PH'd at about 5.5 and after 7 days....yes 7 days, I get rooted clones. This has worked for me everytime I have done it and clones always rooted within 7 days and I have tried this with different strains with the same results in 7 days....I am sure its the roots excelurator that is making them root so fast