Hydroponics systems must be geared to the needs of the crop you grow. They can be active or passive. Active hydroponics systems let nutrients pass over your plant roots. This means you have to use a large-sized root zone medium like vermiculite or perlite. Air circulation is better in active hydroponics systems because one is making more efforts towards circulating the solution. In passive hydroponics systems, plant roots are suspended into nutrient solutions, but they sometimes need anchorage and support as they grow.
Hydroponics is essentially a water-based system of growing. Highly productive, hydroponics systems are geared towards the conservation of water and land, besides being easier on the environment. You have to know what you want to be doing with hydroponics before you set up your hydroponics system.
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