Rock wool is an excellent medium for growing your plants. Stone wool is a favorite among growers because it is possible to grow a complete life cycle of a crop on stone wool. Stone has the adequate properties for a flourishing root system.
It remains important to adjust the pH before starting your cultivation, since rock wool is naturally alkaline (= opposite of acid). Make sure that you regularly check the values using a pH meter and that you maintain the optimal values with pH solutions.
The advantage of stone wool is that you can control the entire feeding cycle and therefore have total control. Please note that this is a time consuming and precise job. In addition, rock wool is a light and cheap option as a medium.