By the 1970’s, scientists and analysts wee not the only people interest in hydroponics. Traditional farmers and eager hobbyists began to be attracted to the virtues of hydroponic growing. Some of the positive aspects of hydroponics include the ability to produce higher yields than soil-based agriculture and they allow food to be grown and consumed in areas of the world that cannot support crops in the soil. Hydroponic systems use various mediums that are composed from relatively inert materials that have the ability to retain the food rich moisture and have the ability to physically support the plant roots. Growing media for hydroponics includes, expanded clay, rockwool, perlite, vermiculite, Styrofoam, sand, pea gravel, and other mediums. Once the batch has stopped bubbling the fermentation process has ceased and another batch will need to be made in order to continue the production of carbon dioxide. The use of decomposing organic matter is rarely used indoors because of the odor and it is unsanitary because of the bugs it attracts. It can be used outdoors in a greenhouse but the bug problem and their potential diseases need to be addressed in order to save your plants from their adverse effects. If there is a large infestation then there will be webbing visible after a light misting of the plants' leaves. It’s a good idea to take time, and find out how many of your plants are affected. Determining the number of spider mites in your garden, the size of the area they cover, and the size of the infestation will give you an idea of how to eliminate them. Many of the items you need for hydroponics can already be found around your house so you can save money before you go full tilt into this hobby. The first thing any hydroponic gardener needs is a dedicated area for their gardening. Most newbie gardeners can either purchase an easy to install grow room or build a greenhouse outside of their home. For impoverished people who live in a terrain or climate inhospitable to agriculture, hydroponics offers a means of growing food. In areas where food is traditionally produced, but where fields are over crowded or stripped of their nutrients, hydroponics is a way food can be produced using a minimum of space and resources.