Signs of air pollution include spotting or twisting of the plant’s leaves, flower and bud fall off, and unusual discolorations as well as poor growth can signal a problem. Remember, plants are affected by the following elements: air, temperature, light, water and pollution. If you take all of these things into consideration when planning your hydroponic garden your plants are sure to thrive under your care. The plant roots are suspended within the water by various designs and the crop obtains the food nutrients directly from the water, or from an air mist sprayed directly unto the plant roots. Hydroponics also requires the use growing media. 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. The nutrients in a hydroponic system are mixed with water and sent directly to the root system. Hydroponic systems use apparatus that are varied. There are two basic divisions between systems: water culture and media based. Systems may also be active or passive. Active systems use pumps and usually timers and other electronic gadgets to monitor the operation. The process is the same as creating a batch of wine, beer or mead. 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. Plants are able to change their own cellular pH level to stop or help speed up a certain enzyme reaction. The electrical charges in soil particles are different from those in mixtures with no soil. Because of this reason, different pH levels for nutrient uptake are needed for each type of growing medium. Identifying Spider Mites on your Hydroponically Grown Produce It is important to identify and get rid of any insects living in your hydroponics system. Insects such as spider mites can destroy your hydroponically grown produce. Spider mites like many pests can be terminated in several ways. The best way to avoid a spider mite infestation is by taking precautionary measures.