What affects this indicator? First, much depends on where the water source is located, what soils and minerals prevail in that area. After all, it directly affects what soluble substances will be in the water and change the pH in the “acidic” or “alkaline” side. For example, when a salt formed by a strong acid and a weak base is dissolved, the concentration of hydrogen-ions will grow in water and it will become acidic. By dissolving the same salt formed by a strong base and weak acid, on the contrary, the concentration of hydroxyl-ions will grow, and the water will become alkaline.
The pH can be affected by the most conventional water filters, which are now widely used. The fact is that a lot of people further clean tap water before eating it. They pass it through the filter without even thinking that it might include ion exchange resins. And then during the filtration process, hydrogen ions contained in water will be exchanged for metal ions contained in the resin. As a result, the water will become alkaline. Of course, this does not mean that such water is absolutely not suitable for drinking, but it certainly will not benefit.
Therefore, check its characteristics before buying the filter. Pay special attention to what pH guarantees by the manufacturer of the filter “at the outlet”. It doesn’t have to change. The purpose of the filter is to delay organic matter and mechanical pollution, not to rid water of minerals.