The reverse osmosis treatment system is usually located […]
The reverse osmosis treatment system is usually located below the kitchen sink as it is used to treat drinking and cooking water. The Ro System Component includes a pre-filter, an RO membrane, a pressurized storage tank for treating water, a post-filter and a separate delivery faucet for treated water.
The water supply to the RO unit should be safe. The reverse osmosis unit removes almost all microorganisms, but it is not recommended for this purpose because it may cause contamination due to pinhole leakage or bacterial growth.
1. Prefilter: The prefilter is sometimes referred to as a sediment filter. It removes small suspended particles and extends the life of the membrane. Some membrane units are damaged by the growth of chlorine and other bacteria. A carbon pre-filter can also be recommended if chlorine is present.
2. RO membrane: There are several reverse osmosis membranes to choose from. The most common material is cellulose acetate or polyamide resin. Mixtures or variants of these materials are also used. Each product has certain advantages and limitations that require careful consideration.
3. Tanks: Most RO units supply treated water at very low rates, so a 2 to 5 gallon tank is used to provide a suitable supply. When the faucet is turned on, these units are pressurized to generate sufficient flow. Sink storage requires minimal pressure to deliver water. Other locations may require increased delivery pressure, which may degrade membrane performance.
4. Post-filtration: The main reason for post-filtration is the removal of any unpleasant taste and any residual organics from the treated water. Typically, carbon filters are used for this purpose. When a carbon filter is used as part of the pre-filtration step, post-filtration is typically eliminated.
5. Conveying faucet: A separate treatment water delivery faucet is used to obtain treated and untreated water.
6. Other: Most systems do not require special controls because they operate by using pressure sensitive switches, check valves or flexible air bags. Globe valves are important for water conservation during periods of low usage. Monitoring instruments or service lights are becoming more common and help to understand if the system is working properly.