Zeolite Bio Ceramic Ball (3mm to 4mm Ball) - 500 Grams (1.1 Lbs) - Made in Japan, Made From Top Quality Natural Clinoptilolite Zeolite Mined in Japan Zeolite removes ammonia. Removes and improves water clarity, color and odor Porous ceramic ball provide ideal growing site for beneficial bacteria Ceramic balls promote gas exchange and increase dissolved oxygen levels. Includes: 1.1 lbs. 3mm-4mm ceramic balls Made in Japan by one of Top Zeolite mining and manufacturing companies in Japan.