Oyster shells for pond - 5KG per bag

Oyster shells help maintain good GH+ and KH+ levels. These oyster shells have a stabilizing effect on KH and pH levels.  KH indicates the carbonate hardness of the water. 

Many people think that if their tap water is hard, it will not cause any problems with the KH and pH of the water. KH works somewhat like a buffer for the acidity (pH) of the water.

Fish, plants, and the biological filter "consume" the water hardness (KH). If the water is not changed enough during the winter, for example, the KH can drop quickly. KH also drops quickly during rainy periods. This has major consequences for fish, because the pH can drop suddenly.

KH is not measured regularly enough in ponds. Only when problems arise, and therefore when it is already too late, do people try to remedy the situation by adding KH+ powder, for example. But KH+ powder has a number of disadvantages:

• much of the powder disappears through the bottom drain / filtration system
• a short-term boost effect, large fluctuations in water levels
• it is necessary to constantly measure and add powder

Oyster shells ensure a complete long-term stabilization of KH and pH. Oyster shells only dissolve when the KH level drops, thus having a buffering effect on the pH.

They do not depend at all on the amount of rain, water changes, or the seasons: oyster shells ensure a stable level of KH and pH values in the water. Only when the oyster shells are practically dissolved is it necessary to add more. As a rough guide, one bag of oyster shells per year will be sufficient for a volume of 10 m3; the required quantity naturally depends on the factors described above.

Oyster shells are delivered in a mesh bag, they can be easily rinsed. The oyster shells are washed with chlorine and then dried: a guarantee of the elimination of harmful bacteria, fungi, and germs. The shells are also suitable for use as biological filter material in a drip system or in a multi-chamber system.