Biological media provide habitat for beneficial microorganism, so they can efficiently breakdown nitrogenous toxins such as ammonia into less harmful compounds.
Ideal for fish pond, water fountain, waterfall, indoor aquarium and wet ,dry.
Ceramic Filter Ring helps decompose ammonia and nitrate efficiently.
The ceramic material can stand any chemical reaction and is good for both fresh and salt water tanks.

• Color: Yellow; Package Content: 21 x Aquarium Filter Rings,1 x Net Bag
• Total Size: 2.6 x 2.4 x 0.8cm/1.02" x 0.94" x 0.3"(Out.D*H*Inner.D); Material: Ceramic
• Net Weight: 237g
• Product Name: Aquarium Filter Ring
• Net Bag Size: Stretch:29 x 28cm/11.4" x 11"(H*W)

Color: Yellow; Package Content: 21 x Aquarium Filter Rings,1 x Net Baguxcell