OASE BioMaster 850
- EasyClean pre-filter module – Module can be removed separately from the rest of the filter. This reduces maintenance, increases filter efficiency, and extends the life of main filter foams. Customize the pre-filter with coarse 30 ppi, fine 45 ppi, ultra-fine 60 ppi, and activated carbon 45 ppi filter foams
- No mess maintenance – Integrated safety locking features on the handle, pre-filter, and check valve in the inlet/outlet connection unit, ensure no accidental spillage or messy maintenance
- Sealed filtration pathways – Allows for the full benefits of all four stages of filtration through this intuitive design
- Hel-X Biomedia – An extremely large protected settlement surface (800m²/1000 liter) that allows beneficial bacteria to grow and thrive. The material is designed to stop floating as soon as it reaches a certain level of bacteria colonization.
- Carbon pre-filter foams – Activated carbon absorbs unwanted substances in aquarium water. Carbon filter foams make replacement much simpler than using common granular carbon
- Adjustable flow control – Flow can be adjusted for the inlet and outlet in multiple locations on the filter assembly
- Easy priming – Includes simple priming for fast and easy startup and continued operation
- Quiet operation – Sound dampening design
- Heater integration capability – Easily integrate an OASE HeatUp 400 adjustable heater into the BioMaster canister (HeatUp not included)
- Ideal for use in aquariums up to 225 gallons
- Made in Italy, backed by German engineering
- Fresh and marine water compatible
- UL certified filter
- 3 year warranty plus 1 year warranty extension with online registration
Key Features
- EasyClean pre-filter chamber for extremely simple filter cleaning and top comfort
- Available with or without integrated HeatUp adjustable heater for undisturbed views of the underwater world without visible technology, optimum temperature level, improved safety
- Perfect water quality thanks to the high filter volume consisting of Hel-X and filter sponges
- Optimum filtration: Fine 45 ppi pre-filter sponge to optimise mechanical filtration of coarse dirt and prolong the lifespan of biological media
- EasyClean prefilter module: No more bothersome dismantling of the filter – simply remove the pre-filter module, rinse and replace
- Optional: Includes HeatUp integrated adjustable heater with BioMaster Thermo – can also be retrofitted
- High filter volume: The combination of mechanical and highly effective biological filtration with Hel-X ensures healthy and clear aquarium water
- Practical: Venting button for effective water suction to get started quickly and easily during installation and after cleaning
- Safe: Shut-off mechanism and safety lock prevent unwanted water leakage, e.g. when removing the pre-filter module
- Well-regulated: Control the flow on the filter or via the adapter set
What’s in the box
OASE BioMaster 250 Canister Filter Box contains Aquarium Filter, four carbon pre-filter foams, one 20 ppi filter foam, two 30 ppi filter foams, Hel-X Biomedia, intake tube with inlet strainer, water distributor nozzle, spray bar, inlet and outlet adapters with flow control, tubing, fittings, heater adapter, and power cable
OASE Bio Master Model Comparison
| Bio Master | 250 | 350 | 600 | 850 |
| Power consumption | 15 W | 18 W | 22 W | 25 W |
| Max. flow rate | 900 l/h | 1100 l/h | 1250 l/h | 1550 l/h |
| Filter volume | 4.4 l | 5.6 l | 6.8 l | 8 l |
| Pre-filter volume | 0.40 l | 0.50 l | 0.60 l | 0.60 l |
| Number | 42733 | 42734 | 42735 | 77106 |

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