Manufactured in California, Mountain Air filters are a range of filters which have been designed to give maximum quality, performance and durability. No other filter has been able to last more than 3 years of constant use -so you can be assured it will give you long lasting odor control. Its simple functionality contains complex interior designs using the most unique materials. They require little maintenance and reduce noise levels considerably, ensuring an effective and efficient growing life cycle. They also offer superior airflow when compared to normal filters due to the very low density, but high mechanical strength of 'activated' carbon used, which in turn gives better results and peace of mind. These special activated carbons contain a unique chemistry, granular size, shape, texture and hardness to offer longer life and prevent blockages, which will help maintain an all-round cleaner filter system for improved durability. Mountain Air filters are extremely economical, the bigger the size the more economically it operates, giving you a huge saving and more value for money. We believe this is the most efficient filter on the market today that will guarantee to remove Volatile Organic Compounds (VOC). Supplied with 2 filter sleeves which are hand and machine washable. Why choose Mountain Air? Superior carbon compaction means a longer life and more effective odor removal.