【3 in 1 Functions】① Water change. Built-in double airbags, atmospheric cavity, good resilience, effortless operation.② Sand washer. Aquarium siphon with 3D filter net, protect your love fish and small gravel from being sucked out of the aquarium. ③ Debris suction. Aquarium sludge vacuum water change kit with a duckbill suction inlet attachment, making it easier to suck out sludge and debris. 【Working Principle】 Hygger aquarium gravel cleaner equipped with a hand press with handle, which provides more working space and saves labor and convenience by testing the fastest pressing speed seven times. The sand washer has two thickened airbags inside, which can pump water quickly. And using PP-ABS materials, you don't have to worry about airbag damage and leakage, and it can be used for a long time. 【Powerful 3D Filter Basket】The aquarium gravel cleaner has an internal filter to prevent gravel clogging. It effectively separates and removes debris from your aquarium. The sludge aquarium