Maintaining the proper pH level in the nutrient reservoir is most likely the single most critical factor to successful hydroponic gardening. If the pH factor goes too high or too low, the plants will not do well and will show confusing signs or nutrient deficiencies. Nutrients are a key factor in a successful hydroponic garden. The environmental good that hydroponics produces with its decreased water consumption is somewhat negated by the amount of energy needed to support hydroponic growing. Much hydroponic growing happens in greenhouses, where significant amounts of electricity are used trying to give the hydroponic plants all the light the need. The hydroponic systems also require less space, because the plant roots don’t have to spread and search for food and water. The small space requirement makes hydroponics perfect for limited space home gardeners. The greatest benefit to hydroponics is the ability to automate the hydroponics system with timers and remote monitoring equipment. Fuels that contain sulfur or sulfur compounds cannot be used because they produce harmful by products when they burn. Dry ice can be used in small greenhouses, especially if a cooling effect is also desired. Dry ice, which is solid carbon dioxide, is effective when used in a well-sealed area. The ice can either be used in block form or broken down into small pieces and used a little at a time. With hydroponics, important growing factors such as light, temperature, and humidity can be controlled. Since there is no soil, there is less maintenance involved with hydroponics. There is no need for weeding and the worry of pests or soil borne diseases is drastically reduced. Hydroponics is always a soil less culture, but not all soil less cultures are considered to be hydroponics. All of these salts must be thoroughly dissolved before being allowed to circulate around your root systems. Micronutrients are also needed for proper growth of your plants. Boric acid, manganese chloride, zinc sulfate, copper sulfate and iron sulfate can be used in minute amounts in the nutrient solution.