Oyster Shell Pond Filter Media Natural Source of Calcium Carbonate Koi Goldfish Fish Aquarium
Oyster shells, simply the best you can get, I found nothing better/safer to maintain kh & ph. It is simple to use, just add to your existing bio chamber or near water fall etc. I usually break them into 50p coin sizes and mix with alfagrog or flocor in bio chambers. The bag mesh is large enough not to clog, and offers good through flow. Can sell them in smaller bags message for more details thanks. £25 per 10kg bag Ad ID: