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https://www.swelluk.com:443/oase-bio-master-external-filters/ 
Oase BioMaster External Filters
The BioMaster can not only be conveniently concealed in the aquarium base cabinet, it is also easy to clean. The prefilter can be completely removed, simply rinse out and re-insert it - neat and clean thanks to the EasyClean prefilter module. The aquarium filter is available with or without the HeatUp adjustable heater.
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Product Information
The BioMaster or BioMaster Thermo is an external filter for aquariums between 250 and 600 litres in size with high fish stock. It offers convenience for the most rigorous requirements.
These BioMaster external filters are packed with a combination of mechanical and highly effective biological filter media meaning a much larger surface area for bacteria to colonise resulting in cleaner, clearer water.
Included is all the filter media, hoses, adaptor, intake and outflow tube, as well as water diffuser. Suitable for both freshwater and marine aquariums and guaranteed for up to 3 years. Replacement filter foams are available from the Swell UK website.
The BioMaster ensures discrete highly efficient filter technology outside of your aquarium! The sister BioMaster, the BioMaster Thermo is also available to buy from Swell UK.
| Suitable Aquarium Size (Max.) | Dimensions (LxWxH) | Power Consumption | Power Cable Length | Guarantee | Max. Flow Rate | Max. Head Height | Hose (Qty/Lgth) | Connection for hoses ΓΈ (inner/outer) | Filter Volume | Prefilter Volume | Suitable for Freshwater | Suitable for Saltwater | |
| 250 | 250L | 240 x 240 x 370mm | 15w | 1.5m | 3 + 1 Years | 900 l/h | 1.3m | 1 Unit/4m | 16/22mm | 4.4l | 0.40l | Yes | Yes |
| 350 | 350L | 240 x 240 x 425mm | 18w | 1.5m | 3 + 1 Years | 1100 l/h | 1.4m | 1 Unit/4m | 16/22mm | 5.6l | 0.50l | Yes | Yes |
| 600 | 600L | 240 x 240 x 480mm | 22w | 1.5m | 3 + 1 Years | 1250 l/h | 1.8m | 1 Unit/4m | 16/22mm | 6.8l | 0.60l | Yes | Yes |