Hydroponics uses water to transport nutrients to the plants. Root systems can sit directly in the water, a sandy base, coconut husks, perlite, peat moss, or even gravel that the nutrient rich water travels through. You will need to provide some sort of fertilizer dissolved into the water. Hydroponics is considered to be economical as it uses less water, less fertilizer and pesticides. Most of the food obtained in this manner is organic. Hydroponics also requires less space than a traditional garden as you can grow vertical. However, any water based disease would travel quickly through all the plants.