Maxi Jets are fully submersible. They are quite strong and consume only about 20 watts. Great for hydroponic systems or draining large tanks. The Maxi Jet 1200 pumps approximately 295 gallons per hour. This is a great pump to use in hydroponic systems that require higher pressure and a higher volume of water. All the parts are plastic which will keep this pump from being corroded by the nutrient solution in your reservoir. This is a quality product that will give you years of performance.