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a white, chalky substance which is the principal hardness and scale-causing compound in water, siseveekogude vees leiduv kaltsiumi ja süsihappe sool, mis mängib olulist rolli kareduse ja puhverdusvõime kujundajana
calcium carbonate . Limnoloogia sõnastik. Estonian Language Institute, Sõnaveeb 2026. https://sonaveeb.ee/search/unif//lim/calcium%20carbonate/1/eng (13.07.2026)