pH control of water is one of the most important tasks for every aquarium owner. Tests allow for a quick response and adjustment of the water's pH using specialized preparations before an incorrect H2O pH harms our fish - they may become lethargic, more susceptible to diseases, and vulnerable to parasites. For more sensitive species and individuals, prolonged exposure to water with an incorrect pH can lead to death. Poor pH also negatively affects the plants inside the aquarium, causing them to stop growing and deteriorate. As aquarium enthusiasts, we have prepared a collection of high-quality preparations that will allow for timely intervention and provide answers on how to change the pH of aquarium water to neutral and best replicate conditions close to natural ones.