The Maxspect Nano-Tech Anaerobic Blocks are a highly efficient filter media designed to naturally reduce nitrate levels in both freshwater and marine aquariums. Utilizing proprietary nano-ceramic technology, these blocks foster the growth of anaerobic heterotrophic bacteria. These beneficial bacteria complete the nitrogen cycle by converting harmful nitrates into harmless nitrogen gas through denitrification, ensuring a healthier aquatic environment.

Each package contains two durable anaerobic blocks, each measuring 3 3/4" x 3 3/4" x 1" and offering an impressive surface area of 11,033 square feet per block. This unique nano-ceramic, porous structure creates an anoxic interior, ideal for establishing robust colonies of denitrifying bacteria like Paracoccus denitrificans and various Pseudomonads. One set of blocks is capable of treating aquariums up to 1,000 liters or 264 gallons and is designed for direct placement in your sump.

These Anaerobic Blocks are perfect for aquarists seeking a low-maintenance and long-lasting solution for nitrate reduction in their freshwater or marine setups. With an approximate lifespan of six months before needing cleaning or partial replacement, they offer sustained nitrate control. For optimal performance, it is recommended to stack two blocks horizontally in the sump, potentially with a denitrification catalyst, and to replace blocks incrementally to maintain established bacterial colonies.