[3-in-1 Aquarium Cleaning Tool] 1.Water Changer. This aquarium siphon is designed with a vacuum siphon to change water easily and efficiently. 2.Vacuum. Equipped with duckbill suction mouth, it can easily suck away faeces and impurities. 3.Scrape Algae. The duckbill suction mouth can also scrape off algae and scrape moss inside the aquarium. Our aquarium vacuum cleaner is equipped with a squeezing airbag. By gently squeezing the airbag, powerful suction is achieved without the risk of sewage entering your mouth. [Adjustable Water Flow and Transparent Hose] Our fish tank vacuum cleaner has an adjustable water outlet valve, you can choose the right water flow for better control of the plotting process. You can observe the whole suction process through the transparent hose. [High Quality Material and Flexible Hose] The aquarium vacuum cleaner set is made of high quality PP, plastic, stainless steel, PET and other materials, long lasting and durable. With a full length of 300CM/10 FT, the hose is flexible and can be bent and turned freely, allowing you to easily clean the bottom of your fish tank or the bottom of your small bathtub pool of impurities without emptying the existing pool water. [How to Use] Put the water changer into the fish tank or small fish tank pool, the outlet of the other end of the water pipe into the bucket, open the water system valve, gently squeeze the air bag by hand 5-7 times until it automatically discharges water, lower the inlet to suck out the fish faeces and in the water. [Widely Used] This manual siphon water changer and cleaning brush set tool can be used not only as a fish tank aquarium cleaning, but also in spas, hot tubs, and small above ground pools, which is very practical. It is not suitable for large swimming pools or drainage systems with large impurities as it takes a long time.