Best type of medium to start clones in for Clay pellets

What is the best medium to start my clones in for clay pellets
Rockwool works well, but use the smallest cubes you can find. Rapid rooters work well too. Do NOT use jiffy pots, the flat round little discs that you add water to expand them out. They suck eggs.

Rooting in an aero cloner is best.
 
Top