Marineland Penguin Bio-Wheel Power Filter (HOB) – for 10 to 50 Gallon Tanks

The Marineland Penguin Bio-Wheel Power Filter is one of the most trusted hang-on-back (HOB) filters in the aquarium hobby. It uses a three-stage system—mechanical, chemical, and biological filtration—to keep your water clean and healthy. The unique Bio-Wheel provides excellent biological filtration by giving beneficial bacteria a place to grow, which helps maintain stable water conditions.

What makes this filter especially convenient is that it comes in several sizes, from 10 gallons up to 50 gallons, each with a different GPH (gallons per hour) rating. GPH simply means how much water the filter can cycle every hour. The smaller models push around 75–150 GPH (perfect for tanks up to 20 gallons), while the larger models reach up to 200 GPH (ideal for 50-gallon community aquariums). This ensures that no matter the size of your tank, you get the right water flow to keep it clear and healthy.

It’s easy to set up, quiet, and replacement cartridges are widely available—making it a beginner-friendly choice that still satisfies experienced hobbyists.

👉 In short: a reliable HOB filter with strong biological filtration, available in multiple sizes and flow rates to fit aquariums from 10 to 50 gallons.