Next-Level Filtration

New Penguin® PRO and 
Emperor® PRO Power Filters.

Making an already strong-performing lineup even stronger.


Produces less than
40 decibels of sound.

The same level as a quiet room.


Expect more
from your filter.

H.O.B. filtration to make your own.

The Excitement is building

Three years of consumer research helped us engineer two of our most advanced filters, continuing one amazing legacy.

Its improved impeller and motor assembly deliver best-in-class flow rates, while the upgraded spray bar design prevents clogging. The dual filter chamber features our exclusive BIO-Wheel® technology, 10% more biological surface area to ensure constant spinning. The submerged, self-priming motor and motor dampener make it one of the quietest filters available, producing less than 40 decibels of sound (about the same level as a quiet room).

emperor cutaway img - Home

Adjust. Change. Fine-Tune. Tailor. Perfect.

Our new filters give hands-on hobbyists the ability to modify a range of features to suit their needs.

Take control of your filtration with these

Customizable features

Smartly redesigned, we built the Penguin® PRO and Emperor® PRO Power Filters for those who love to build. That’s why, before adding any improvements to enhance customization, we unpacked three years of consumer feedback to understand what users wanted (and didn’t want) in a filter. The result is a new line of hang-on-back filters that let seasoned aquarium keepers add their personal touch to advanced filtration.

emperor cutaway image - Home

All Penguin® PRO and Emperor® PRO Power Filters deliver easy, three-stage mechanical, chemical and biological aquarium filtration.

penguin 125 - Home

Penguin® PRO 125

For up to 20 GAL

penguin 175 - Home

Penguin® PRO 175

For up to 30 GAL

penguin 275 - Home

Penguin® PRO 275

For up to 50 GAL

penguin 375 - Home

Penguin® PRO 375

For up to 75 GAL

emperor 450 - Home

Emperor® PRO 450

For up to 90 GAL


Choose from a variety of filter media options to keep your aquarium clean, clear and healthy.


Developed specifically for the new Penguin® PRO and Emperor® PRO Power Filters, our expanded portfolio of filter media allows for customization typically found only in canister filtration. Now, carbon doesn’t have to fight ammonia, odors, free-floating algae, parasites and crud alone – it has an army.