Enjoy quiet， clean and clear waters with the Zoo Med Micro Pump 104. This versatile， submersible pump works well in both freshwater and saltwater. The adjustable flow rate makes it ideal for internal filter applications， terrarium waterfalls， small ponds and even desktop fountains. Each unit runs virtually silently to help your waterscape stay serene. Plus， a special new feature enables the pump to run dry for up to 30 days without damage. This pump was surely designed for your peace of mind!