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Kalkgehalt im Wasser: Calzium und Magnesium = Karbonathärte
Für ein optimales Pflanzenwachstum ist es empfehlenswert, eine möglichst tiefe Karbonathärte zu haben. Erstrebenswert wäre eine Härte zwischen 4-10 °dH, dadurch haben wir durch den Kalk noch etwas Puffer, das heisst, dass das Aquarienwasser stabiler ist.
Je höher der Kalkgehalt im Leitungswasser und Aquarium ist, desto heikler wird ein gediegener Pflanzenwuchs und es kann zu einer biogenen Entkalkung führen (weisse-, poröse Blattoberfläche).
Gemessen wird die Karbonathärte mit einem herkömmlichen Tröpfchentest aus dem Fachhandel.