I send email to Clonex and they just reply me, may be useful for everyone^^
The Growth Technology Clonex is a high performance rooting hormone gel and will work well when using an aeroponic cloning unit like the one in the picture below. One of the draw back with using an aeroponic cloning machine, as opposed to taking cuttings into a growing substrate, is that once you put the new cutting in the machine it washes off the gel. Fortunately the Clonex works instantly, and penetrates the plant tissue as soon as it is exposed to the gel. I would suggest leaving the cuttings in the Clonex for a few minutes before putting them in the aeroponic unit to ensure that the plant material has absorbed the maximum amount of the hormone gel. From there it should be ok to run the unit as usual. Please see the link below for more information and instructions for Clonex.