The largest size in the BioMaster Thermo range, the 850 external filter will work effectively to improve water quality in your aquarium thanks to its high filter volume which consists of Hel-X and filter sponges.

Ideal for use in freshwater and marine aquariums, this filter comes complete with multi-stage filtration which will create optimum aquarium water quality. Complete with various fine and coarse sponges that are mounted on the inside of the main filter section, as well as 2 layers of Hel-X 13 BioMedia, this product's innovative combination of grade foams and BioMedia produces unparalleled mechanical and biological filtration. This combination will prolong the product's longevity, ensuring an extra-long service life.

The EasyClean pre-filter section can be easily removed for cleaning - the best part being that you won't need to worry about disconnecting the hoses! Also included is a robust built-in priming button which facilitates a fast startup either after cleaning or upon installation.

Despite its size, this filter runs extremely quietly and doesn't use much power, meaning it won't cost you an arm and a leg in energy bills. What's more, the shut-off mechanism and safety lock will prevent unwanted water leaks during the filter cleaning process.

Don't forget that this product also comes with an integrated and adjustable heater for precise water temperature control.

Key Features

  • Largest Size External Filter in the BioMaster Thermo Range
  • Suitable for Aquariums Up to 850 Litres
  • Large Filter Volume to Ensure Clear and Healthy Aquarium Water
  • Includes EasyClean Pre-Filter Chamber for Efficient Rinsing and Replacing
  • Includes Venting Button for Efficient Water Suction
  • Includes Shut-Off Mechanism and Safety Lock to Prevent Unwanted Water Leaks During Filter Cleaning
  • Includes Adjustable Aquarium Heater
  • Easily Control the Filter Flow via the Adaptor Set
  • Very Quiet and Economical


Brand: Oase
Filter Power Consumption: 32W
Filter Volume: 8 Litres
Heater Power Consumption: 400W
Height: 53.5cm (1ft 9in)
Length: 24cm ( 9.4in)
Maximum Flow Rate: 1550 Litres Per Hour
Maximum Head Height: 2.2m
Suitability: Fresh & Saltwater Aquariums Up To 850L
Voltage: 230V, 50Hz
Weight: 7kg (15lb)
Width: 24cm ( 9.4in)
Delivery Information

Fast Free UK Delivery on orders over £60.00.*
Smaller orders under £60.00 are subject to a £4.95 delivery charge. Delivery will typically be made within 2 - 3 working days but may be extended during peak times.

We Can Offer Next Day Delivery for £7.95*
To meet our deadline for this service you must order before 11.00am to ensure delivery for the next working day. This excludes weekends and bank holidays.

*Extra charges or restrictions will apply to certain UK postcodes. These include parts of Scotland, The Highlands, Northern Ireland and offshore Isles. Please note Next Day delivery is not available to these locations. Please click here for a full list of postcode exclusions and contact us today for a personalised quote.

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