OASE BioMaster 2 350
#1 in 76 to 150 galFull review
A top choice for 55 to 90 gallon tanks, pairing lots of media with the easiest pre-filter cleaning here.
Amazon $249.99$249.99
The OASE BioMaster 2 350 rates 3.7 among 76 to 150 gal aquarium canister filters; the OASE BioMaster 2 250 rates 3.7 among up to 75 gal ones. The OASE BioMaster 2 250 costs $20 less ($229.99 vs $249.99).
Prices were last checked November 9, 2026. Product prices and availability are accurate as of that date and are subject to change; the price and availability shown on Amazon or the retailer's site at the time of purchase apply. As an Amazon Associate we earn from qualifying purchases.
OASE BioMaster 2 250
#2 in Up to 75 galFull review
A convenient, well-built filter for tanks up to 70 gallons, at its best for owners who want a quick-rinse pre-filter.
Amazon $229.99$229.99
Scores side by side
These two sit in different tank size classes (76 to 150 gal and up to 75 gal), and each is scored against the reference points for its own class, so a rating says how well each does among its own tank size peers. How we rank explains each factor.
| Factor weight | OASE BioMaster 2 350 | OASE BioMaster 2 250 |
|---|---|---|
| Overall rating | 3.7/5 | 3.7/5 |
| Value 25% | 43 $2.78 per rated gallon ($249.99, up to 90 gal) | 34 $3.29 per rated gallon ($229.99, up to 70 gal) |
| Media volume 20% | 86 5.6 L of media, 0.6 L per 10 rated gal | 87 4.4 L of media, 0.6 L per 10 rated gal |
| Turnover 20% | 52 300 gal/h for up to 90 gal, 3.3x per hour | 59 250 gal/h for up to 70 gal, 3.6x per hour |
| Efficiency 10% | 80 18.8 gal/h per watt (16 W) | 67 16.7 gal/h per watt (15 W) |
| Features 15% | 85 priming button or self-priming, shutoff valves, separate pre-filter, adjustable flow | 85 priming button or self-priming, shutoff valves, separate pre-filter, adjustable flow |
| Warranty 10% | 50 3-year warranty | 50 3-year warranty |
Specifications
| OASE BioMaster 2 350 | OASE BioMaster 2 250 | |
|---|---|---|
| Capacity | ||
| Rated aquarium | Up to 90 gal | Up to 70 gal |
| Pump output | 300 gal/h | 250 gal/h |
| Turnover | 3.3x per hour | 3.6x per hour |
| Max head height | 5.9 ft | 5.6 ft |
| Media | ||
| Media volume | 5.6 L | 4.4 L |
| Pre-filter volume | 0.5 L | 0.4 L |
| Features | ||
| Primer | Yes | Yes |
| Shutoff valves | Yes | Yes |
| Separate pre-filter | Yes | Yes |
| Adjustable flow | Yes | Yes |
| Built-in UV | No | No |
| Built-in heater | No | No |
| Water-change valve | No | No |
| Power and build | ||
| Power draw | 16 W | 15 W |
| Warranty | 3 years | 3 years |