Material: Fish tank Gravel cleaner is made of high-quality environmentally plastic, it can be reused for a long time, not easy to be damaged, and can also ensure the safety of fish.No need to worry about the water pollution. Keep Fish Safe:The Syphon Gravel Cleaner has a circular filter at the suction mouth, which can prevent sucking up the small fish and shrimp.Will not hurt any aquarium life when in use. Easy to Use:Put the suction port and hose into the fish tank,gently squeeze the air cavity by hand until it automatically discharges the water, lower the water intake, to suck out Fish manure and feed residues in the sand. Keep The Water Clean:The fish tank gravel cleaner can help clean sand and stones and the residues and stains attached to the grass and sand bed.And it can easily change the water,keep the water clean. Indispensable Aquarium Companion:The aquarium gravel cleaner is a system with a manual controller,The design of the enlarged and thickened airbag can strengthen the suction, save time and effort.