The Bio master thermos 250 has an integrated heater in compact Filter design
The built-in heater provides your aquarium with Precise and uniform temperature levels while the product integration delivers unobstructed views of your Aquarium
External filter operates quietly to circulate and filter your aquarium water
Includes 4-stage filtration: biological, mechanical, chemical, and prefiltration
Hel-x, suspended Filter media, creates the optimal surface area for beneficial bacteria growth

Integrated heater – Provides precise and uniform temperature levels and reduces the amount of equipment seen inside the aquarium by housing the heater in the unit
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.
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
Ideal for use in aquariums up to 70 gallons