Buy external filters for aquariums at the Petonus Online Shop

Aquarium External Filters for Nano to Large Tanks

An aquarium external filter reliably ensures clear water and stable parameters in your tank. Thanks to its large filter volume, debris is removed and beneficial bacteria have plenty of space to break down harmful substances. This way, your fish, shrimp, and plants will feel completely at home. 

In the Petonus Online Shop, you’ll find certified models from OASE, JBL, and Fluval in proven brand quality.

What Is an External Aquarium Filter?

An external aquarium filter operates outside the tank, usually in the cabinet. Water is drawn in through hoses, passed through various filter media, and returned to the tank after being purified. This process removes debris and supports biological processes carried out by bacteria. The major advantage over an internal filter is the significantly larger filter volume and the space saved inside the aquarium.

Types of Aquarium External Filters

External filters are available in various designs that offer additional benefits:

• External filters with a heater replace the heater rod in the tank
• External filters with a UV clarifier reduce algae and bacteria
• Backpack filters and nano models are suitable for small tanks and space-saving solutions

Aquarium External Filters by Size

To ensure your aquarium runs smoothly, you should always choose a filter with slightly higher capacity than the tank volume requires. This table shows the appropriate external filters for common tank sizes:

Buy aquarium external filters online at Petonus

Whether you’re looking for an external filter for a 60-liter tank, a 200-liter tank, or high-performance models for large aquariums—at Petonus, you’ll find certified quality from top brands. Order conveniently online and enjoy fast delivery and personalized advice.

Buy an aquarium external filter from Petonus now and keep your tank running reliably.