The Exo Terra Monsoon Water Filter is a replacement filter cartridge for the Exo Terra Monsoon misting systems. This fine filter purifies the misting water by trapping debris and mineral particles, preventing clogged nozzles and ensuring the system runs smoothly. It’s easy to replace and helps extend the life of your Monsoon pump and nozzles – for best results, use distilled water and change the filter regularly to keep mist output optimal.