Overview The OASE BioMaster 850 Thermo external filter combines four‑stage filtration with built‑in heating, delivering a streamlined solution for both freshwater and marine aquariums

Designed for tanks up to 225 gallons, it minimizes clutter around the display and supports stable temperatures across the water column

A thoughtfully sealed filtration pathway directs water through media in an efficient sequence, helping you achieve clear, consistent water without added equipment clutter

Filtration design and media Water first passes through the pre‑filter’s activated carbon foams to reduce toxins and odors, then enters the main chamber where foams of varying densities work alongside Hel‑X Biomedia

This setup provides substantial surface area for beneficial bacteria while preserving smooth, reliable flow

You can customize the pre‑filter with different pore foams—coarse 30, fine 45, and ultra‑fine 60 ppi—for a tailored balance of flow and filtration

4‑stage filtration with Hel‑X Biomedia and varied-density foams for robust biofiltration Pre‑filter foams in coarse 30, fine 45, and ultra‑fine 60 ppi customization Hel‑X Biomedia provides high surface area to support beneficial bacteria Sealed filtration paths ensure water travels efficiently through media Setup, operation, and maintenance Setup is eased by fast priming and adjustable flow control on both the inlet and outlet

The EasyClean pre‑filter can be removed and cleaned separately, reducing maintenance time and extending filter life

Built‑in safety locking on the handle, pre‑filter, and inlet/outlet valve helps prevent spills during servicing

The unit also quiet operation thanks to a sound‑dampening design, so filtration remains unobtrusive in your space

For temperature control, you can pair the BioMaster 850 with an OASE HeatUp adjustable heater (not included)

Crafted with Italian manufacturing and backed by German engineering, the BioMaster 850 emphasizes reliability and efficiency in everyday use

It carries a three‑year warranty, with a one‑year extension available upon product registration

Easy priming for quick startup and continued operation Quiet operation with sound‑dampening design Heater integration capability with OASE HeatUp (heater not included) Adjustable inlet/outlet flow to fit your tank needs Safety locking features to prevent accidental spills Made in Italy with German engineering What you get for your aquarium The BioMaster 850 provides a compact, efficient filtration solution that keeps water clean and temperatures stable without adding a lot of visible gear

Its combination of robust media, customizable pre‑filters, and thoughtful safety and maintenance features makes it a versatile choice for serious hobbyists and hobbyists upgrading from smaller setups

FAQ Q: Is the BioMaster 850 suitable for saltwater aquariums

A: Yes, it supports freshwater and marine setups up to 225 gallons

Q: What maintenance features help simplify upkeep

A: Easy priming, removable EasyClean pre-filter, and safety locks minimize spills and maintenance time