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Natural, very finely ground limestone transported by tankers from the Krkonoše Mountains is used for liming. The application of limestone will increase the pH value, alkalinity and conductivity in the tank. The assumed target pH value is 6.8. Subsequently, the concentration of problematic substances in raw water, especially aluminum, will decrease. Liming will thus contribute to better treatment of water, which in the end will bring better quality drinking water for the inhabitants of Jabloneck. Regular liming also has side effects, it creates a suitable environment for the establishment of a strong population of salmon-like species of fish, such as American grayling, but it also helps the gradual return of brown trout, the original inhabitants of the streams of the Jizera Mountains.