Our high quality carbon filters are the best on the market. Using activated carbon, these filters absorb unwanted smells as the expelled air passes through them, simply attach a suitable extraction fan and ducting to replenish the growroom with fresh air. Installing the filter is quick and easy. The filter should actively remove smells for up to 12 months. Each filter can be recharged when necessary. Replacement outer filter sleeves are also available. Ensuring a clean sleeve will assist the filter in its operation.