Description: This perpetual filter contains an effective filter material that removes harmful impurities and other contaminants from your aquarium. It works outside the aquarium, significantly reducing resonance and ensuring that the filter does not generate too much noise during operation. You can adjust the flow with the flow control switch on the filter according to your needs. Characteristics: Energy-saving motor: the motor uses seamless machine core, hydrodynamic design, energy saving more than 50%. Replaceable filter material: The filter plate and cotton filter can be removed immediately after some time for cleaning, as well as replaced with other filter materials. It is suitable for both freshwater and saltwater aquariums, improving oxygen dissolution. Adjustable flow value to adjust the flow and dissolved oxygen for your pet. It is suitable for water circulation, biochemical water filtering, and adding oxygen to aquarium water. Technical data: Material: acrylic Color: shown as pictures Power: 3W Plug Type: EU Plug Flow rate: 250 l/h Voltage: 220V 50Hz Filter size: ok. 7*8*10 cm/2.7*3.1*3.9 inch Total height: ok. 19,5 cm / 7,7 inch Package weight: ok. 247g Line length: ok. 1.1m/43.3in The package includes: 1 * Outdoor Filter for Aquarium Note: 1. When using it for the first time, remember to fill the filter with water. The deeper the suction pipe, the better, then connect the power supply. In the event of a power failure, fill the filter with water when the power is turned on again so that you can continue using it. If the filter box is not filled with water, it will also make noise. During use, it must be filled with water. 2. 3.