Hydroponics (or soilless agriculture), is the cultivation of plants performed on neutral and inert substrate (sand type pozzolan, ball clay, rock wool etc.). We added to the system a filtering vessel in the path of the water. The advantage of this system is that the drainage and replacement of water are no longer necessary, since the operation is closed cycle. thanks to the biological filter, water nutrients throat with each pass and thus continues to be able to feed the plants.
