Pond Planet Oyster Shells 2kg | Filter Media | Pond Buffer

Kockney Koi

Pond Planet Oyster Shells 2kg | Filter Media | Pond Buffer\nOyster Shells provide an easy and reliable way to keep your ponds KH and pH values correct. The KH value is the measure of the water\u2019s carbonate hardness. Oyster shells have an exceptional stabilising effect on the KH value and consequently indirectly on the pH value which is very important for your ponds inhabitants. Many people believe that if their tap water relatively hard then they won\u2019t have any problems with KH or pH values. The KH to some extent acts as a buffer to the water\u2019s degree of acidity. Fish, plants and bacteria within the biological filter \u2018consume\u2019 the water hardness (KH). During the winter period if too little water is changed, the KH can quickly become too low. The KH value can also drop quickly when there is too much rain. This affects the fish, because this can cause the pH value to drop steeply (referred to as a pH crash). A pond\u2019s KH value generally is not measured reguly