- An RO water system has numerous parts, with the most important being a semipermeable membrane that blocks a high percentage of impurities and contaminants. The system may also have additional types of filters, depending on the substances you need to eliminate, such as bacteria, chlorine, nitrates, hydrocarbons, sulfates and heavy metals such as mercury and lead.
- RO water purification begins when you turn on a specific faucet connected to the system. You obtain purified water from a holding tank, and more tap water moves through the purification system to replace the amount you removed. The standard RO storage tank holds up to 2.5 gallons of water, according to ESP Water Products. Larger tanks and even whole-house systems are also available. Be aware that a whole-house system requires substantial plumbing work and considerable upfront cost.
- An RO system contains one or more prefilters. These typically are sediment filters that remove substances such as sand and silt. Another prefilter might be a carbon filter that removes chlorine and odors. The system generally also includes a carbon filter as a post-filter to eliminate any residual taste and odor. Between the prefilter and post-filter is the RO membrane. This membrane is responsible for removing the largest portion of impurities and contaminants. The purified water moves to the holding tank, and substances blocked by the membrane drain away.
- In addition to blocking impurities and contaminants, an RO water system also blocks minerals commonly found in groundwater, including sodium, calcium and magnesium. This means the system blocks a certain level of nutrients and flavor, as well. In addition, some municipalities add fluoride to water to protect against cavities; the RO water system blocks that mineral too. If you want your children to have some additional fluoride, ask your dentist about the best way to do so.
Impurities and Contaminants
Holding Tank
Process
Considerations
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