why on and off. why not leave them on all the time?
For clones I would leave it on all the time also. This is from the net for a aeroponic cloner tip and hints section
Golden Rule: When cuttings go into the system, fill the tank with water and leave the pump on 24/7. Constant access to water and oxygen encourages the cutting to root quickly. When roots begin to show add nutrient at a quarter of the manufacturers recommended dosage.
Once roots begin to show, open the vents slightly. Gradually increase the opening every day and remove the lid completely to harden off for a couple of days before transplanting on.
Rooting gels and powder can still be used with the Clone Master. When the cutting is dipped, all active ingredients are absorbed immediately and will not be washed off by the misting.
Cuttings are ready to transplant into soil or coco when roots begin to poke through the mesh pot. Pot on into 3 or 4 pots and grow on for a few days before transplanting on to larger pots.
To transplant cuttings into rockwool cubes:
Either; remove from the Clone Master when roots begin to poke through the mesh pot. Sandwich the cutting between two halves of a Grodan SBS cube, Jiffy 7C or a few Grodan Grow Cubes and place into a 3 or 4 cube. Allow to grow on until the larger cube is root bound, then transplant.
Or; remove when roots have grown 3 to 4 out of the mesh pot. Punch a hole in the bottom of a 3 or 4 Grodan cube, and place the cutting and mesh pot into the cube, allowing the roots to trail through the punched hole. Transplant immediately.
