Understanding Primo's Purification Process
Primo water sold at Walmart, particularly the exchange and refill options, is correctly labeled as 'purified water with added minerals'. This means it undergoes a multi-step purification process that is not solely distillation. The process includes several stages, most importantly reverse osmosis (RO). In reverse osmosis, water is forced through a semipermeable membrane under pressure. This membrane removes a vast majority of dissolved solids, contaminants, and impurities, including bacteria, heavy metals, chlorine, and salts. Other stages of purification often used by Primo include carbon filtration and ultraviolet (UV) sanitization to ensure maximum quality and safety.
The Crucial Role of Added Minerals
After the intensive purification process, which can sometimes leave water tasting 'flat,' Primo adds a specific blend of minerals back into the water. These minerals, which may include sodium bicarbonate (baking soda), calcium chloride, and magnesium sulfate, are added to improve the taste and give the water a crisp, refreshing quality. This final step is the most significant reason why Primo water is not considered distilled. Distilled water, by definition, is stripped of virtually all dissolved solids and minerals, and no elements are added back in.
What is True Distilled Water?
Distillation is a specific purification method involving boiling water and collecting the resulting steam after it has condensed back into a liquid. Because only the water vapor is collected, all non-volatile contaminants, minerals, and solids are left behind. The result is an incredibly pure form of water, with a near-zero total dissolved solids (TDS) reading. Distilled water has a very neutral, often described as 'flat,' taste due to the absence of minerals. This purity makes it suitable for specific applications, but less desirable for drinking for many people.
Applications for Distilled Water
- Medical Equipment: For use in CPAP machines.
- Home Appliances: For steam irons, humidifiers, and diffusers to prevent mineral buildup.
- Automotive: For car batteries and cooling systems.
- Laboratory Use: For precise scientific experiments.
Primo Water vs. Distilled Water: A Comparison
| Feature | Primo Water (at Walmart) | Distilled Water |
|---|---|---|
| Purification Method | Multi-stage, including reverse osmosis and UV sanitation. | Boiling water into steam and then condensing it back into a liquid. |
| Mineral Content | Minerals (like calcium chloride, magnesium sulfate) are added back for taste. | Minerals are removed during the process, resulting in near-zero mineral content. |
| Taste | Crisp and refreshing, enhanced by added minerals. | Flat and bland due to the lack of minerals. |
| Best for | Everyday drinking, hydrating the family, and general consumption. | Appliances, medical devices, and specific scientific or industrial uses. |
| Availability at Walmart | Sold at refill and exchange stations, and in large bottles. | Sold as a separate product, often under the store brand. |
Dispelling the Distilled Myth
The misconception that Primo water is distilled often comes from a misunderstanding of purification methods. While distillation is one form of purification, it is not the only one. Primo's use of reverse osmosis and subsequent remineralization creates a product that is highly purified but is not distilled. For those seeking true distilled water, it is important to check the product label carefully. Walmart offers both purified (Primo) and true distilled water products, so reading the packaging is essential to get the right type for your needs.
Choosing the Right Water for Your Needs
The best water for you depends entirely on its intended use. If you need clean, great-tasting water for drinking, cooking, or for use in your Primo dispenser, the purified Primo water is an excellent choice. If, however, you need water for specific applications where mineral buildup is a concern, such as in humidifiers, steam irons, or for scientific purposes, then a true distilled water product is required. Understanding this key difference ensures you always get the right water for the job.
Conclusion
In short, Primo water at Walmart is not distilled water. It is purified through a multi-stage process that includes reverse osmosis, and it has minerals added back for taste. While this makes for delicious drinking water, it is not mineral-free and should not be used in appliances that require distilled water. Always read the label to ensure you have the correct type of water for your application. For those needing true distilled water, a different product must be selected. For more detailed information on water quality, Primo Water provides a comprehensive breakdown of its standards on its website.
