Japanese oyster shells pond filter medium

In order to increase the carbonate hardness in soft pond water and thereby stabilize the pH value, Japanese breeders have been using Japanese oyster shells pond filter medium for years. The offered quantity of the Japanese oyster shells pond filter medium is packed in the filter media bag, is deposited in the pond filter or in the pond and is sufficient for a pond volume of approx. 15,000 liters. With the Japanese oyster shells pond filter medium, you increase the carbonate hardness in the pond water slowly and sustainably in a completely natural way. The shelf life of the Japanese oyster shells pond filter medium is approximately 1 year, after which they must be replaced. For larger koi ponds, several bags of Japanese oyster shells have to be brought in pond filter media.