The Mars Hydro 4-inch (100mm) Inline Air Purifier uses top-grade 1050+ Virgin Australian charcoal to neutralize odors, delivering fully clean and fresh airflow. Perfect for grow tents, hydroponic setups, and basements, it efficiently eliminates odors from plants, pets, and smoke. This versatile filter can be used as both an intake and exhaust component when paired with a 4” inline fan. Featuring a durable build with dual-sided galvanized steel mesh and aluminum flanges, it includes a washable pre-filter cloth for added protection. Designed for easy maintenance, the filter allows convenient carbon refills every three months for peak performance.