Pond Filter Media » Japanese Oyster Shells » Japanese Oyster Shells Halves

Japanese Oyster Shells Halves

These are large Pacific Oyster shells and are a superb method to buffer and maintain a constant pH to your Koi pond.

This comes supplied with a nylon sack ready for total immersion into the filter.

This is exactly the same media that 9 out of 10 Japanese breeders keep in their filtration systems