Activated carbon can be used to help reduce the pH of water. This is because activated carbon is highly absorbent, which allows it to adsorb impurities from the water that may cause an increase in pH levels. In addition, activated carbon has a very large surface area for its size, and this also helps it to adsorb pollutants as well as organic molecules like humic acid and other compounds that can raise the pH of water. When these impurities are removed from the water using activated carbon filtration systems, then both levels will decrease significantly. Activated carbon also works by releasing ions into the solution, leading to buffering action which results in lower overall pH values in your system. Therefore, while there may still be some fluctuations depending on external factors such as rainfall or evaporation rates within your environment, you can rest assured that with regular use of an effective filtration system containing activated charcoal filters you will see a significant reduction in pH over time.