Oyster Shells will generally raise the pH level in your water and stabalise it .

Oyster shells stabilise the pH / KH-value which prevents pH crash. If the KH value drops to this starts to dissolve the shells until balance is reached again. Nitrifying bacteria also grows on the oyster shell aiding in the biological filtration of your pond.

How to use Japanese Oyster Shell Halves.

You can either add the Oyster shell to your filtration system or simply hang the bag over the edge of the pond suspending the bag below the water level. The ideal location to place the Oyster shell would be just after a water return to the pond as the returning water will flow the through the media bag resulting in good contact with the Oyset Shell.

Oyster Shells will generally raise the pH level in your water and stabalise it .

Oyster shells stabilise the pH / KH-value which prevents pH crash. If the KH value drops to this starts to dissolve the shells until balance is reached again. Nitrifying bacteria also grows on the oyster shell aiding in the biological filtration of your pond.

How to use Japanese Oyster Shell Halves.

You can either add the Oyster shell to your filtration system or simply hang the bag over the edge of the pond suspending the bag below the water level. The ideal location to place the Oyster shell would be just after a water return to the pond as the returning water will flow the through the media bag resulting in good contact with the Oyset Shell.