Oase BioMaster External Filters

2 reviews

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. Cash back voucher offers available on all BioMaster External Filters at Swell UK.


  • BioMaster 250
    code: 42741 Out of stock (
    More stock due in 1 day
    Free: £5 Voucher to spend online
  • BioMaster 350
    code: 42742 In Stock (Only 2 left!)
    Free: £10 Voucher to spend online
  • BioMaster 600
    code: 42743 In Stock (Only 1 left!)
    Free: £10 Voucher to spend online

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 ConsumptionPower Cable LengthGuaranteeMax. Flow RateMax. Head HeightHose (Qty/Lgth)Connection for hoses ø (inner/outer)Filter VolumePrefilter VolumeSuitable for FreshwaterSuitable for Saltwater
250250L240 x 240 x 370mm15w1.5m3 + 1 Years900 l/h1.3m1 Unit/4m16/22mm4.4l0.40lYesYes
350350L240 x 240 x 425mm18w1.5m3 + 1 Years1100 l/h1.4m1 Unit/4m16/22mm5.6l0.50lYesYes
600600L240 x 240 x 480mm22w1.5m3 + 1 Years1250 l/h1.8m1 Unit/4m16/22mm6.8l0.60lYesYes

Latest Customer Reviews

  • Rating
    Date 28/12/2021 08:12am
    Oase BioMaster 350
    Feefo Logo
    Excellent filter, easy maintenance
  • Rating
    Date 04/11/2020 00:11am
    Oase BioMaster 250
    Feefo Logo
    Great filter works well 😁
  • Rating
    Date 26/10/2020 14:10pm
    Oase BioMaster 600
    Feefo Logo
    Great product , best filter I’ve ever owned highly recommended.