growSYSTEM AIRPOT is the perfect system for gardeners, who prefer to grow on substrates like coco, soil, perlite, rock-wool, or mapito. This cultivating method requires a bit smaller tank as growing on other substrates like hydro stones, clay pebbles, and hydro korrels. The smaller reservoir is the only difference between growTOOL® growSYSTEM HYDRO. Super-root Airpot provides the best root development and results in a great and vital plant growth and blooming as well. Manufactured and assembled 100% in Germany! Go hydro with growTOOL®!