Generally, RO water tends to be slightly acidic, typically falling within a pH range of 6.0 to 6.5.
Understanding RO Water pH
Reverse Osmosis (RO) water filtration systems are designed to remove impurities, minerals, and contaminants from water. This process often results in water with a lower pH than the original source water. Here's a more detailed explanation:
- The RO Process: RO systems use pressure to force water through a semi-permeable membrane. This membrane blocks most dissolved substances, including minerals that contribute to alkalinity (higher pH).
- pH Levels: pH is a measure of how acidic or alkaline (basic) a substance is. A pH of 7 is neutral. Values below 7 are acidic, and values above 7 are alkaline.
- Slightly Acidic Nature: Because RO systems remove alkaline minerals, the resulting water usually has a pH slightly below 7, making it slightly acidic. The reference states RO water is typically between 6.0 and 6.5 pH.
- Acidity Comparison: To put this in perspective, common beverages like coffee, tea, fruit juice, and carbonated drinks have even lower pH values and are therefore more acidic than typical RO water. Even milk is more acidic.
Why RO Water is Slightly Acidic
The absence of minerals is the primary reason RO water is slightly acidic. Carbon dioxide from the air can also dissolve into the water, further lowering its pH.
Is Slightly Acidic RO Water Harmful?
For most people, drinking slightly acidic RO water is not harmful. The human body has natural mechanisms to regulate pH levels. However:
- Remineralization: Some RO systems include a remineralization stage to add back beneficial minerals and increase the pH. This is an option to consider if you're concerned about the long-term effects of drinking slightly acidic water.
- Individual Sensitivities: Individuals with certain health conditions may want to consult with a healthcare professional regarding the suitability of RO water.
Summary
While RO water typically has a pH slightly below neutral, classifying it as slightly acidic (usually between 6.0 and 6.5), it's generally considered safe to drink for most people. The acidity is often less than that of many common beverages. Remineralization options exist for those who prefer a higher pH.
