This overflow is extremely quiet. It is filled with coarse media, such as ceramic or plastic bio balls. The tube at the top of the knee piece allows you to control the water level in the aquarium. The inlet is about 6.5 cm below the water line so leaves cannot get in easily. It is always recommended to install two or an emergency overflow to prevent your aquarium from overflowing.
It comes standard with a hose grommet 25mm. You will need a 35mm glass drill bit.
The 75mm variant can handle 1500-3000 litres/hour.
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