JBL Procristal i30Internal filter for aquariums from 10 40 litres. Key Features: For crystal clear & oxygen rich water: internal filter for 10 40L aquariums with adjustable pump capacity up to 200 l h. Easy to install: attach suction cups to one side of the filter (both sides possible), press the filter to the desired position, position so that the water outlet is approx. 2cm below the water surface. Safe for small fish and shrimps: no sucking in thanks to fine pored