Ceramic Ring Perforated White 500g Aquarium Water Filter Material

??Ceramic Ring Smooth surface type
??Used as an address for badtoria to make a biological filter system.
??Does not change the pH of the water in the system.
??Suitable for indoor Filter partition, filter outside the cabinet, filter on the cabinet.
??The hole in the middle helps distribute the water direction. Makes the water get more oxygen
??Trap dirt in the water
??Helps to increase oxygen in the water
??There is a hole in the middle that allows water to flow through well.
??Ceramic size approx. 1.9 x 1.9 cm.

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