Wacredo Oyster Shells 5 kg Bag KH and pH Stabiliser Shell Grit Mussel Shot Filter Medium

Filter medium - Oyster shells have a very stabilising effect on the carbonate hardness of the water (KH value) and thus also on the acid content (pH value). Influences - Fish, plants and biological filters break down the carbonate hardness in the water. Even due to a lot of rainfall and little water renewal in winter, the KH value can drop sharply. This can lead to a sudden sharp drop in the pH value. Dosage - Coarsely rolled, 1 bag (5 kg) of oyster shells is required per 10 m³ of water per year. The exact amount depends heavily on the described influences and other factors. Production - The oyster shells are washed with chlorine and then dried, which ensures that no harmful bacteria, fungi or germs settle on them. ✅ SATISFACTION GUARANTEE - If you are not 100% satisfied with the oyster shells, then you can return them within 30 days and benefit from our warranty.