Oyster Shell Mix, Oyster Shell, Oyster, Calcium, Bore, Borei Those who are repeat purchasers will receive a bonus, so please let me know in the comments before purchasing if possible. I am also selling the same item on Yahoo Flea Market. This is a mixture of oyster shells, powdered to about 4mm. Powder accounts for 30-40%, and 0.5-4mm accounts for 60-70%. 200g is about 220ml. The prices and quantities are as follows. Please tell me the desired quantity in the comments. There is plenty of stock. 200g: 300 yen 300g: 360 yen 400g: 420 yen 500g: 470 yen 750g: 600 yen 1000g: 720 yen 1500g: 970 yen 2000g: 1170 yen 3000g: 1410 yen 4000g: 1630 yen 5000g: 1830 yen I also sell different particle sizes. As a trial, I can also include samples of coarse, powdered, and fine sizes, so please comment. The shells have been desalted, then heated and dried at around 500 degrees Celsius to sterilize them. The main component of oyster shells is calcium carbonate. For calcium supplementation for small birds and chickens. For adjusting the acidity of horticultural soil. Since powder is mixed in, it may be a little difficult to use for aquarium filter media, etc. Raw materials: Oyster shells (made in Miyagi Prefecture) Alkaline content 50.0% Nitrogen...0.2% Phosphoric acid...0.15% Potassium...0.03% Calcium...94.8% Magnesium...0.40% Silicic acid...3.09% In addition, it contains trace amounts of manganese, boron, zinc, copper, iron, molybdenum, etc. When used as feed for living creatures, there is no expiration date or best-before date for oyster shells, but please use them within 2 years of opening as a precaution.