Hydroponics system is a special structure that holds water and/or other inert medium and provides places to grow plants. You can build your own system or buy a ready-made solution. Nowadays, there are plenty of options to choose from.
Inert hydroponic medium
New kinds of growing medium pop up on the market almost every day. Some of the common types are rockwool/stonewool, oasis cubes, vermiculite, perlite, coconut fiber (coir), peat, lava rock, fiberglass insulation, composted bark, pea gravel, sand, expanded clay, sawdust, pumice, foam chips, polyurethane grow slabs and rice hulls. Each alternative has its pros and cons, and the choice will depend on many variables, including the size and type of plants you wish to grow and the type of hydroponics system you use.