1. Kupu Whakataki
The OASE BioMaster 250 is an external canister filter designed for aquariums up to 70 gallons (250 liters). This filter provides multi-stage filtration to maintain optimal water quality and clarity in both freshwater and marine environments. Its design emphasizes ease of maintenance and quiet operation.
This manual provides detailed instructions for the safe and efficient installation, operation, and maintenance of your OASE BioMaster 250 filter. Please read all instructions carefully before use and retain this manual for future reference.
2. Nga korero haumaru
- Always disconnect power to the filter and any other aquarium equipment before performing maintenance or handling the filter.
- Me whakarite kia whakatakotoria te tātari ki runga i tētahi mata pumau, papatahi i raro i te taumata wai o te ika hei whakahaere i te mahi tika me te whakakī.
- Kaua e whakahaerehia te tātari mēnā kua pakaru te taura hiko, te mono rānei.
- Ko tenei taputapu mo te whakamahi i roto anake.
- Kaua e taea e nga tamariki.
- Follow all directions included in the package.
3. Hua Neke Atuview
The OASE BioMaster 250 external filter integrates several key features for effective aquarium filtration:
- Maha-stage Tātari: Combines biological, mechanical, chemical, and prefiltration stages.
- Kōwae Tātari-Mua EasyClean: A removable pre-filter for quick and easy cleaning without disassembling the main filter.
- Hel-X Biomeida: Suspended filter media designed to provide a large settlement surface for beneficial microorganisms, aiding in nutrient reduction and toxin removal.
- Sealed Filtration Pathway: Ensures water flows efficiently through all filtration stages.
- Heater Integration Capability: Allows for the integration of an OASE HeatUp adjustable heater (sold separately) directly into the canister.
- Mahi Ataahua: I hangaia kia iti ai te haruru i te wā e whakamahia ana.

Figure 3.1: The OASE BioMaster 250 external aquarium filter, showcasing its compact design and blue accents.

Whakaahua 3.2: Runga view of the OASE BioMaster 250 filter head, showing the inlet/outlet adapters and priming button.

Whakaatu 3.3: Neke Atuview of key features including 4-year guarantee, 70-gallon capacity, German engineering, and Italian manufacturing.

Whakaatu 3.4: Taipitopito view of the EasyClean Pre-Filter Module, Hel-X Biomeida, and the integrated heater slot.

Pikitia 3.5: Kauwhata e whakaatu ana i te 4-stage filtration process within the BioMaster filter, showing water flow through pre-filter, mechanical, biological, and chemical media.
4. Tatūnga me te Tāuta
Before beginning installation, ensure all components are present and undamaged. The package includes the aquarium filter with filter media, tubing, intake and outflow tubes, diffuser, spray bar, fittings, heater adapter, and power cable.

Figure 4.1: All components included with the OASE BioMaster 250 filter, such as tubing, intake/outflow pipes, and various fittings.
4.1 Huihuinga Wāhanga
- Whakaritea te Paapāho Tātari: Ensure all filter media (pre-filter foams, biological media, chemical media) are correctly placed in their respective baskets within the filter canister. Refer to the internal diagrams for correct layering.
- Hononga ngongo: Attach the intake and outflow hoses to the filter head unit. Secure them with the provided fittings.
- Install Intake and Outflow Tubes: Place the intake tube (with strainer) and outflow tube (with diffuser or spray bar) inside the aquarium. Secure them to the aquarium rim using suction cups or clips.
- Position the Filter: Place the filter canister on a stable surface below the aquarium water level. This is crucial for proper water flow and self-priming.
4.2 Te Whakakī i te Tātari
The BioMaster 250 features a self-priming function for easy startup:
- Me whakarite kei te mau tonu ngā hononga ngongo katoa, ā, kei te tika te tūnga o te tātari.
- Open the inlet and outlet valves on the filter head.
- Press the priming button (usually located on top of the filter head) repeatedly until water begins to flow into the filter and fill the canister. This may take several presses.
- Once water fills the canister and flows through the outflow tube, connect the power cable to an electrical outlet. The filter pump will start, and water circulation will begin.

Figure 4.2: A person adjusting the OASE BioMaster filter placed inside an aquarium cabinet, demonstrating typical installation below the tank.
5. Nga Tohutohu Whakahaere
Once installed and primed, the OASE BioMaster 250 operates continuously to filter your aquarium water.
- Whakaritenga Rere: The inlet and outlet adapters feature flow control levers. These can be adjusted to regulate the water flow rate according to your aquarium's needs.
- Diffuser/Spray Bar: The included diffuser or spray bar can be used to create uniform surface movement and enhance dissolved oxygen levels in the aquarium.
- Whakaurunga Whakamahana (Whiringa): If you have an OASE HeatUp adjustable heater, it can be integrated into the filter canister for a cleaner aquarium aesthetic. Follow the heater's specific instructions for installation into the BioMaster.

Figure 5.1: The OASE BioMaster filter demonstrating the optional integration of a HeatUp heater into the canister for efficient heating and a tidy setup.
6. Tiaki
Regular maintenance is essential for the optimal performance and longevity of your OASE BioMaster 250 filter.
6.1 Te Horoi i te Kōwae Tātari-Mua EasyClean
The EasyClean pre-filter module allows for quick cleaning without opening the main filter canister:
- Momotu Mana: Always unplug the filter from the power outlet before any maintenance.
- Remove Pre-Filter Module: Unlock and carefully pull out the pre-filter module from the top of the filter head.
- Rinse Foams: Remove the pre-filter foams and rinse them thoroughly under running aquarium water (or dechlorinated tap water) until clean. Avoid using untreated tap water as it can harm beneficial bacteria.
- Huihuia: Place the cleaned foams back into the module and reinsert the module into the filter head, ensuring it locks securely.
- Honoa Anō te Mana: Plug the filter back into the power outlet.
This pre-filter should be cleaned every 1-2 weeks, depending on aquarium bioload and debris accumulation.

Figure 6.1: A hand demonstrating the removal of the EasyClean Pre-Filter Module from the top of the OASE BioMaster filter for routine cleaning.
6.2 Full Filter Cleaning (Main Canister)
The main filter canister, including biological and chemical media, requires less frequent cleaning, typically every 3-6 months or as needed based on flow reduction.
- Momotu Mana: Unplug the filter.
- Engage Aquastop: Close the inlet and outlet valves on the filter head. The aquastop mechanism allows you to disconnect the hose assembly without water leakage, keeping the tubes in the aquarium.
- Tangohia te Upoko Tātari: Release the locking clips and carefully lift the filter head from the canister.
- Clean Media Baskets: Remove the media baskets. Rinse mechanical filter foams and biological media in old aquarium water to preserve beneficial bacteria. Replace chemical media (e.g., activated carbon) as recommended by the manufacturer, typically monthly.
- Clean Canister and Impeller: Clean the inside of the canister and inspect the impeller for debris.
- Huihuia: Reassemble the media baskets, ensuring they are correctly stacked. Secure the filter head onto the canister, ensuring all clips are locked.
- Reconnect Hoses and Prime: Reconnect the hose assembly, open the valves, and prime the filter as described in Section 4.2.
- Honoa Anō te Mana: Plug the filter back in.

Figure 6.2: The aquastop feature on the OASE BioMaster filter, allowing for easy disconnection of hoses from the filter head without water spillage during maintenance.
7. Te Raru
This section addresses common issues you might encounter with your OASE BioMaster 250 filter.
| Raruraru | Take pea | Rongoā |
|---|---|---|
| No water flow or reduced flow |
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| Filter is noisy or vibrating |
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| Te rerenga wai |
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| Air purging into the tank (bubbles) |
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8. Whakatakotoranga
| Āhuahira | Taipitopito |
|---|---|
| Ingoa Tauira | Kaiwhakaako koiora 250 |
| Tauira Tuemi | 55145 |
| Waitohu | OASIS |
| Tank Volume Capacity | Up to 70 Gallons (250 Liters) |
| Ahu (LxWxH) | 9.4 x 9.4 x 14.6 inihi |
| Taumaha Tūemi | 11.2 Pauna |
| Rauemi | Kirihou |
| Tae | Pango |
| Whenua Taketake | Itari |
| Āhuahira Motuhake | EasyClean pre-filter module |
| UPC | 706759551458 |
9. Pūtāhui me te Tautoko
The OASE BioMaster 250 comes with a 3-tau iti pūtāhui. He taapiri 1 tau te roanga whakamana is available upon online product registration. Please refer to the official OASE website or the documentation included in your product packaging for detailed warranty terms and conditions.
For technical support, spare parts, or warranty claims, please contact OASE customer service. Contact information can typically be found on the OASE webte waahi kei roto ranei i te kohinga hua.
Rehitatanga Hua Online: Tirohia te paetukutuku mana o OASE website to register your product and activate your warranty extension.





