Understanding Total Dissolved Solids (TDS)
Total Dissolved Solids, or TDS, is a measure of the combined content of all inorganic and organic substances contained in water, in molecular, ionized, or micro-granular suspended form. It is typically expressed in milligrams per liter (mg/L) or parts per million (ppm). A TDS reading is used as a general indicator of overall water quality, though a high TDS level doesn't automatically mean the water is unsafe to drink; rather, it suggests a higher concentration of minerals, salts, and other particles.
The Purification Process Behind Aquafina's Low TDS
Aquafina uses a sophisticated, proprietary seven-step purification system known as HydRO-7™. This extensive process is the reason for the brand's low TDS level. Key stages in the HydRO-7 system include:
- Pre-filtration: Water first passes through filters to remove larger particles and sediment.
- Activated Carbon Filtration: This step helps remove organic compounds and chlorine, which can affect the taste and odor of the water.
- Reverse Osmosis (RO): This is the most critical stage for achieving a low TDS. Water is forced through a semi-permeable membrane that has extremely small pores, effectively stripping away almost all dissolved solids, including salts, chlorides, and minerals.
- Ozonation: Water is disinfected with ozone (a powerful oxidant) to ensure microbiological purity.
- UV Light: As an additional safeguard, water is treated with ultraviolet light to neutralize bacteria.
This meticulous process ensures that Aquafina consistently delivers a low TDS, resulting in its signature 'pure' and neutral taste.
Aquafina vs. Other Bottled Waters and Tap Water
The TDS of water can vary significantly depending on its source and purification method. Comparing Aquafina to other common water types helps illustrate just how low its TDS is.
Comparison Table: TDS Levels
| Water Type | Typical TDS Range (ppm) | Mineral Content | Taste Profile | Purification Method |
|---|---|---|---|---|
| Aquafina (Purified) | 4 (average) | Very low; removed by RO | Neutral, clean, and flat | Reverse Osmosis, Ozone, UV |
| Dasani (Purified) | ~28 | Low; minerals added for taste | Slightly enhanced flavor | Reverse Osmosis; often with minerals added |
| Evian (Spring Water) | ~247 | High; naturally occurring | Mineral-rich flavor | Natural filtration via underground rock |
| Tap Water | Varies widely, often 50-500+ | Varies by source; contains minerals and other solids | Varies greatly; can be metallic, earthy, or neutral | Municipal filtration; typically less intensive than RO |
The Difference Between Purified and Spring Water
Aquafina is a prime example of purified water, which, by definition, is water that has been treated to remove almost all dissolved solids. Spring water, on the other hand, comes from an underground source and is known for its natural mineral content, which gives it a distinct flavor and a higher TDS. Aquafina's purification process is designed to create a consistent and uniform product, regardless of the source water, while spring water's characteristics can vary based on its geological origin.
The Significance of Low TDS in Drinking Water
The debate over low versus moderate TDS water often comes down to taste and nutritional content. For many, the low TDS of purified water like Aquafina translates to a clean, crisp, and predictable flavor profile. However, some argue that the absence of minerals found naturally in spring or well water, such as calcium and magnesium, results in a 'flat' or 'insipid' taste.
For those who prefer a less-is-more approach to their water, the low TDS of Aquafina can be a benefit. It means the water is less likely to carry heavy metals, salts, or other unwanted contaminants that are sometimes associated with a higher TDS level, providing a sense of reassurance about its purity. This is especially important for certain applications, such as for sensitive medical equipment or when mixing with other beverages where you don't want the water's taste to interfere.
Conclusion
In summary, the TDS of Aquafina water is exceptionally low, with an average reading of 4 ppm, according to the manufacturer. This is achieved through its extensive HydRO-7 purification process, which includes reverse osmosis to remove virtually all dissolved solids. While this results in a clean, neutral taste and consistent purity, it is important to understand that it also removes potentially beneficial minerals found in other types of water. The ideal TDS level depends on personal preference, with low TDS appealing to those who prioritize consistency and taste-neutrality, and higher TDS appealing to those who prefer the mineral profile of spring water. Ultimately, Aquafina's low TDS is a defining characteristic of its product, reflecting its commitment to delivering a consistently pure taste.
