The BioCompact line of internal filters is perfect for small freshwater aquariums and paludariums. These compact filters are designed to be discreetly installed horizontally or vertically. BioCompact uses biological, mechanical, and chemical filtration for optimal water quality and clarity. The inclusion of an activated carbon foam optimizes your aquarium filtration and removes cloudy water, harmful metals, odors, tannins or other colors for clear, pure aquarium water. The diffuser with adjustable flow control provides added aeration through increased surface agitation. BioCompact 25 is suitable for use in aquariums up to 10 gallons. Designed using German engineering and manufactured in Italy, this energy efficient filter is supported by a 3 year warranty. Integrated diffuser with three adjustable water flow settings - Allows for uniform surface movement, prevents formation of biofilm, and provides added aeration Simple cleaning and maintenance - Remove individual filter modules while keeping the pump unit in place for easy cleaning and maintenance Carbon filter foam - Activated Carbon helps to remove cloudy water, harmful metals, odors, tannins or other colors for clear, pure aquarium water. Carbon filter foam make replacement much simpler than using common granular carbon. Quiet operation - Sound dampening design Heater integration capability - Easily integrate an OASE HeatUp adjustable heater into the BioPlus filter (HeatUp not included) Ideal for use in aquariums up to 15 gallons Made in Italy, backed by German engineering Freshwater compatible UL certified filter 3 year warranty plus 1 year warranty extension with online registration