Hydroponics can be described as gardening without soil. There are many ways to grow hydroponically and many different systems for growing but hydroponics is simply just plants getting the nutrients from water rather than the soil. Plants need a few of basic elements to grow and survive. Other than oxygen and hydrogen (water) and carbon dioxide, the other elements are usually found in the soil. With hydroponics the other elements: nitrogen (N), phosphorus (P), potassium (K), calcium (Ca), magnesium (Mg), sulfur (S) and others in small amounts are all in the nutrient solution that you feed the plants.
The Hydrofarm hydroponic kits are perfect for science projects or a small herb garden in your kitchen. Each system comes with everything you need to get growing.
The Homegarden is a an active wick type system, it has an air pump to oxygenate the nutrient solution in the base. It measures 28" x 9" and 10" tall. It would be suitable for four to eight plants.
Emily's Garden is a deep water culture system. The pots sit in the nutrient and it's oxygenated with an air pump. It measures 24" x 16" x 6" and has 6 pots.
The Megagarden is an ebb and flow or fill and drain type system. It has 15 pots that sit on a tray above the nutrient solution. There is a pump below that fills the tray periodically. The pump runs on a timer (included). The system measures 22" x 22" x 10".