The VIVOSUN 4" Air Carbon Filter is designed to effectively control smelliness and purify the air in your indoor space. Made with high-quality Australian virgin charcoal, this filter ensures a clean and fresh environment. With an energy star rating of 10 stars, this black filter is efficient and reliable for keeping the air in your home or garden clean and healthy. The VIVOSUN brand is known for producing top-notch products in air ventilation and extraction, making this carbon filter a suitable option for hydroponics and outdoor living spaces.