The Self-Start Siphon feature has made aquarium maintenance a whole lot easier. With the Gravel Vacuum cylinder submerged in the water simply move it up and down a few times to activate the Self-Start Siphon. Gravel Vacuum Cleaners are designed to separate and remove debris from the aquarium during routine water changes. The Mini features a 1-5/8” diameter x 5” long cylinder with a 56” long hose. It is ideal for use in tanks with up to a 10 gallon capacity.