1.Fish Stool Suction Collector/Fish Poop Cleaner Accessories: inside the tank can remove dirt,and keep the water quality,which can improve the ecological environment. Must be placed inside the water use.Suitable for fish tanks of 80cm-100cm. 2.HOW IT WORKS:Purify the water in the fish tank, store fish manure and impurities in the intermediate compartment, suck up the dirty water, and then return the clean water to the water tank. 3.Easy to Use:This filter accessory NEEDS TO BE USED WITH THE AIR PUMP.Just plug it into the air pump and put it into the bottom of the aquarium. Once the middle compartment is full of fish poop, just take it out and clean it before putting it back in the aquarium. material: plastic Color as shown Package Contents: 1 x three impeller accessories Only the above package content, other products are not included. Note: Light reflection and different displays may cause the color of the item in the picture a little different from the real thing. The measurement allowed error is +/- 1-3cm.