What is Reverse Osmosis and How Does it Work?
Reverse osmosis (RO) is a water purification technology that uses a semipermeable membrane to remove ions, molecules, and larger particles from drinking water. In this process, pressure is applied to the water, forcing it through the membrane. The membrane's tiny pores allow water molecules to pass through while blocking dissolved solids and other contaminants. The result is a highly pure form of water with a very low level of total dissolved solids (TDS).
The Complete Filtration Process for Great Value Purified Water
While reverse osmosis is the core of the purification, Great Value water undergoes a multi-stage filtration system to ensure its quality. This comprehensive treatment results in a consistently clean and safe product.
Here is a step-by-step breakdown of the process:
- Multimedia Filtration: The water first passes through a series of filters designed to remove larger particles like sand, dirt, and sediment.
- Carbon Filtration: Activated carbon filters are used to remove chlorine, organic compounds, and other substances that can affect the water's taste and odor.
- Microfiltration: This stage uses very fine filters to catch smaller particles that may have passed through the initial filtration.
- UV Light Treatment: Ultraviolet light is used to disinfect the water by killing bacteria, viruses, and other microorganisms without using harsh chemicals.
- Reverse Osmosis: This is the key purification stage, where the water is forced through a semipermeable membrane to remove up to 99% of dissolved inorganic compounds and other impurities.
- Ozonation: This involves injecting ozone (O3) into the water. Ozone is a powerful disinfectant that helps kill any remaining microbes and maintain the water's purity inside the sealed bottle.
- Remineralization: After extensive purification, minerals like calcium chloride and sodium bicarbonate are often added back to enhance the flavor profile. This step is what prevents the water from tasting "flat" and gives it a clean, satisfying taste.
Purified vs. Spring Water: A Comparison
Understanding the differences between purified water, like Great Value, and spring water can help you decide which is right for you. The distinction lies in the source and the level of processing.
| Feature | Purified (e.g., Great Value) | Spring Water |
|---|---|---|
| Source | Can come from any source, including tap water. | Must come from a natural underground spring. |
| Filtration | Extensive processing, including reverse osmosis, to remove nearly all impurities. | Minimal filtration, mostly to remove sediment, retaining natural minerals. |
| Mineral Content | Minerals are stripped away and often added back for flavor. | Retains naturally occurring minerals from its source. |
| Taste | Neutral and consistent due to the removal and re-introduction of specific minerals. | Varies based on the specific spring's unique mineral profile. |
| Purity | Exceptionally high purity due to multi-stage treatment. | Generally safe, but may contain trace impurities from its natural source. |
Conclusion: The Final Verdict
Yes, Great Value Purified Drinking Water is purified through reverse osmosis as part of a multi-stage filtration process. This rigorous treatment, which also includes carbon filtration and UV light, ensures a high level of purity and a consistent, clean taste. For consumers seeking the highest level of contaminant removal, reverse osmosis provides a reliable option. The final product includes added minerals for a more appealing flavor profile. Ultimately, the choice between purified and spring water depends on personal preference for taste and mineral content. If purity and consistency are your top priorities, the reverse osmosis process used for Great Value water makes it an excellent choice.
Learn more about reverse osmosis systems and how they work in detail from the Environmental Protection Agency.
The Taste Profile of Remineralized Water
As mentioned, the final step in the Great Value purification process involves adding trace minerals back into the water. This is a common practice among bottled water companies that use RO. Without these added minerals, the water can taste "flat" because it lacks the dissolved solids that give most natural waters their characteristic flavor. The blend of added calcium chloride and sodium bicarbonate is carefully controlled to create a consistently clean and neutral flavor that many consumers prefer. For those who dislike the unique, sometimes earthy, flavor of natural spring water, this neutral profile can be a significant benefit.
