External Aquarium Filter AquaNatura TN-45197, Flow 350 l/h, For Aquariums up to 40 L, With Bio Filter Roll and Skimmer

The AquaNatura external aquarium filter TN-45197 provides a flow rate of 350 l/h and is designed for aquariums up to 40 litres. Engineered for combined mechanical and biological filtration, the unit includes a bio filter roll that traps fine particles and supports beneficial bacteria, together with an integrated skimmer that removes surface film and floating debris. The compact housing and connections make it suitable for small freshwater and tropical tanks where space-efficient, continuous filtration is required.

Advantages

The external filter offers steady circulation at 350 l/h, reducing standing zones and improving oxygenation. The included bio filter roll provides a large surface area for colonisation by nitrifying bacteria, which assists in biological ammonia and nitrite removal. An integrated skimmer helps keep the water surface clear of oils and organic films, improving gas exchange. The design aims to lower routine maintenance by combining mechanical pre-filtration and biological media in a single unit.

Suitable for

• Small freshwater aquariums and planted community tanks up to 40 L
• Beginner and hobbyist setups requiring reliable mechanical and biological filtration
• Nano aquariums where an external compact filter is preferred to internal units

When it may not be suitable

This filter is not intended for aquariums larger than 40 litres or for heavy bioloads such as large cichlid or breeding tanks; in those cases a unit with higher flow and larger media capacity is recommended. It may also be unsuitable for marine or reef systems that require specialized protein skimmers and saltwater-compatible media.

Key specifications

• Flow rate: 350 litres per hour
• Recommended aquarium volume: up to 40 litres
• Filtration types: mechanical and biological
• Included media: bio filter roll
• Integrated feature: surface skimmer
• Approximate external dimensions: compact housing suitable for small cabinets or back panels

How to use

Install the AquaNatura external filter according to the manufacturer’s instructions, positioning the intake and return hoses securely on the aquarium rim and priming the unit if required. Fit the bio filter roll in its designated compartment to ensure water passes through the mechanical media before reaching the biological area. Start the pump and check for steady flow and proper skimmer operation at the surface; adjust hose positions to optimise circulation without strong currents that could disturb plants or small fish. Perform regular inspection and replace or rinse the bio roll and clean the skimmer chamber according to usage and tank load.

What to consider before purchase

• Confirm aquarium volume does not exceed 40 L to ensure adequate filtration performance
• Assess the bioload (fish quantity and feeding level) to determine if a higher-capacity filter is needed
• Check available space for external mounting and routing of hoses
• Determine ease of access for routine maintenance and media replacement

Usage recommendations

For best results, pair the AquaNatura filter with regular partial water changes and routine maintenance of the bio filter roll. Monitor water parameters after installation and during the first weeks to allow biological filtration to establish; replace the bio roll on a schedule based on visible fouling and water quality rather than fixed intervals.