GrowBright Prefilter 4”

Replacement pre-filters for GrowBright PureFlow carbon filters. Pre-filters include elastic bands and fit GrowBright brand carbon filters. Pre-filters are a low-cost method for extending the life of your carbon filters. Large airborne particles and dust are trapped by the fibrous, rough material of the pre-filter, which prevents clogging and increases airflow that eliminates the smell, not just dirt.