Ceramic Filter Media Rings Tetra Tetratec CR series for aquarium filters (model CR 400/700/2400) - biological filtration media

Ceramic filter media rings Tetra Tetratec CR series (models CR 400, CR 700, CR 2400) are porous biological filtration media engineered for aquarium filters. Manufactured by Tetra, these ceramic rings offer an extensive internal surface area that promotes colonization by beneficial nitrifying bacteria. When installed in a canister or internal filter compartment, the rings support stable biological filtration, contributing to the reduction of ammonia and nitrite and helping maintain clearer water and healthier conditions for fish and invertebrates.

Advantages

The ceramic rings have a highly porous structure that increases bacterial habitat without occupying excessive space in the filter. Their durable ceramic composition resists breakdown and maintains performance over time. Because they are inert and non-toxic, the rings do not alter water chemistry, allowing biological processes to proceed without unintended side effects. The design is compatible with standard aquarium filter compartments and easy to rinse for routine maintenance.

Suitable for

• Freshwater and marine aquariums requiring biological filtration support
• Canister filters and larger internal filters with media compartments
• Tanks with established stocking where ammonia and nitrite control is necessary
• Aquariums undergoing cycling or recovery after water quality issues

Key specifications

• Material: porous ceramic
• Function: biological filtration media for colonization by nitrifying bacteria
• Compatibility: designed for use in filter media compartments (models CR 400, CR 700, CR 2400 and similarly sized filters)
• Form factor: ring-shaped elements to maximise surface area and flow-through
• Chemical behavior: inert, does not leach additives into water

How to use

Rinse the ceramic rings briefly with dechlorinated or tap water to remove dust before first use. Place them in the biological media compartment of a canister or internal filter so that water flow passes through the rings, ensuring contact with the porous surfaces. Do not replace all existing biological media at once; introduce the ceramic rings gradually to preserve established bacterial colonies. During routine maintenance, rinse the rings gently using aquarium water to avoid removing beneficial bacteria.

Usage recommendations

For stable biological filtration, combine ceramic rings with mechanical and chemical media as needed: mechanical media to trap solids and chemical media for specific contaminant removal. Monitor ammonia and nitrite levels after installation and avoid aggressive cleaning that would drastically reduce bacterial populations. Replace only a portion of the rings at a time if necessary to maintain continuous nitrification.