Single Tank, Electric Demand Water Conditioners Newer units such as these measure water usage to determine the best time to regenerate. But such systems are typically not as efficient as systems that employ two resin tanks. If regeneration is necessary at a time of the day when soft water may be needed, they must wait until a more appropriate time to regenerate so hard water isn't introduced into the home. To do so, single tank DIR units must employ a reserve capacity of softening resin to make it through the rest of the day. If the reserve isn't enough, the home will be forced to use hard water until the system regenerates. If the reserve is too large, the system won't be used to capacity but regeneration will occur anyway, wasting water and regenerant. Twin Tank, Non-Electric Demand Water Conditioners Twin tank systems measure water usage and regenerate only when the system has been used to capacity for optimum efficiency. Because twin tank systems automatically switch from tank to tank as they exhaust, they are able to provide a continuous supply of conditioned water, 24 hours a day. Some systems even use soft water to clean themselves to improve efficiency. Countercurrent regeneration also improves the systems' effectiveness. This process, which is recommended by most resin manufacturers, regenerates the resin beads more efficiently by reversing the flow through the system during the cleaning process. Additionally, leading consumer publications including Consumers Digest have recognized that non-electric, twin tank DIR water conditioners have distinct advantages over those that operate with electricity. Electronic components are the most frequent things to malfunction on electric systems and can be expensive to repair. Non-electric systems do not suffer from such problems and are not susceptible to power outages. Water conditioners may be designed to help with other water problems, too, including the reduction of radium, barium and excess iron. In severe cases, however, a separate system may be required for proper performance. PROBLEM WATER What Is Problem Water? Some water contains troublesome elements or has characteristics which can make it very unpleasant to use or damaging to things that it touches. Among them are iron, manganese, hydrogen sulfide and acidity. Iron Iron typically rears its ugly head as rusty orange/brown stains, streaks or spots on clothing cleaned in a washing machine. Stains also appear on bathtubs, sinks and faucets. Even small amounts of iron can cause problems. Iron in concentrations as low as .3 parts per million can cause staining. And iron staining can be difficult to remove; cleaning may require special solvents. Iron can also clog pipes and damage the internal parts of water-using appliances. Iron is generally found in well water, although city water users are not immune from the problems associated with it.
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