Pets · Comparison
Aqueon Quietflow E Internal Power Filter, 20 Gallon vs Interpet Internal Aquarium Fish Tank Filter, Bio CF1, High Flow Silent Filtration, for Coldwater & Tropical 36-68 Litres: Which Bird & Aquarium Supplies Is Better?
By the Nest & Yard editorial teamUpdated 2026-08-113 min read
Our pick: the Interpet Internal Aquarium Fish Tank Filter, Bio CF1, High Flow Silent Filtration, for Coldwater & Tropical 36-68 Litres — the best Bird & Aquarium Supplies we tested, from £15.59.
Choosing an internal aquarium filter can be tricky, especially when both Aqueon’s Quietflow E and Interpet’s Bio CF1 are available at a similar price point of £15.59 with impressive customer ratings. The Aqueon Quietflow E is a popular choice for smaller tanks, while the Interpet Bio CF1 focuses on biological filtration – a key difference that might suit different aquarium keeper priorities. This head-to-head comparison will delve into these two well-regarded filters to help you decide which offers the best solution for your needs.
See the full range in Bird & Aquarium Supplies.
Planning ahead? Try our free Aquarium Fish Stocking Calculator →| Aqueon Quietflow E Internal Power Filter, 20 Gallon | Interpet Internal Aquarium Fish Tank Filter, Bio CF1, High Flow Silent Filtration, for Coldwater & Tropical 36-68 Litres | |
|---|---|---|
| Price | Unavailable | £15.59↓ Lowest price |
| Rating | Rated 4.5 out of 5 stars (3,240) ↑ Highest rated | Rated 4.5 out of 5 stars (2,140) ↑ Highest rated |
| Material | Plastic | Plastic |
| Price tier | Mid-range | Budget |

Currently unavailable
Pros
- Multi-stage filtration keeps water clear
- Quiet motor suited to living-room tanks
- Rated for tanks up to 20 gallons
Cons
- Replacement cartridges are an ongoing cost

#2 Pick
Interpet Internal Aquarium Fish Tank Filter, Bio CF1, High Flow Silent Filtration, for Coldwater & Tropical 36-68 Litres- Plastic
£15.59
Pros
- 5-stage filtration keeps water clear for coldwater and tropical tanks
- Coir Tech Bio cartridges are simple to swap monthly
- Sucker-mounted cradle makes installation straightforward
Cons
- Sized for tanks up to 68 litres only — larger tanks need the CF2
FAQ
What size aquarium does each filter suit?
The Aqueon Quietflow is primarily designed for 20-gallon aquariums, offering a good flow rate suitable for smaller setups. The Interpet Bio CF1 is better suited to tanks between 36 and 68 litres (approximately 9.6 - 18 US gallons), providing greater surface agitation crucial for gas exchange.
What are the filters made of?
The Aqueon Quietflow utilizes a plastic impeller housing and sponge media, while the Interpet Bio CF1 features a stainless steel pump and ceramic bio-rings. Both use plastics for the majority of their components – always check Amazon listings for detailed material breakdowns.
How much do these filters typically cost?
You can generally find the Aqueon Quietflow E ranging from £25 to £40 on Amazon UK, depending on the retailer and any promotions. The Interpet Bio CF1 usually sits in a similar price range of £30 to £50, with variations based on availability.
How much maintenance do these filters require?
Both filters need regular cleaning – typically every 2-4 weeks depending on the bioload. The Aqueon requires occasional sponge replacement, while the Interpet relies more heavily on maintaining the ceramic rings and ensuring proper water flow.
Are there any safety concerns or regulations I should be aware of?
Always ensure the filter is fully submerged to prevent electric shock. Both filters adhere to UK electrical safety standards, but always check for CE marking and follow manufacturer's instructions regarding placement near water.
What’s the best time of year to change the media in these filters?
It's generally recommended to replace the sponges or media in the Aqueon Quietflow annually, or more frequently if heavily soiled. For the Interpet Bio CF1, cleaning and replacing the ceramic rings should be done seasonally, typically before winter or during a water change.
How does the flow rate of each filter compare?
The Quietflow E is known for its consistent, gentle flow, ideal for smaller tanks. The Interpet Bio CF1 boasts a higher flow rate due to its stainless steel impeller, which can be beneficial for larger tanks or those with heavier bioloads.
Which filter is better for tropical fish?
The Interpet Bio CF1’s increased water movement and bio-rings are generally favoured for tropical aquariums as they promote better gas exchange and maintain optimal temperature. However, both can be used safely with appropriate care and livestock selection.
Can I use these filters in a heated aquarium?
Yes, you can use either filter in a heated tank; however, ensure the heater’s placement doesn't obstruct water flow to the filter. Regularly monitor temperature fluctuations and adjust your heater accordingly.
What should I do if the filter stops working?
Check for any blockages in the impeller or tubing. Refer to the manufacturer’s instructions (Aqueon) or Amazon’s standard returns policy regarding troubleshooting and potential replacements.
In depth
When evaluating products like the Aqueon Quietflow E Internal Power Filter for 20 gallons or the Interpet Bio CF1 High Flow Silent Filtration for aquariums ranging from 36 to 68 litres, it is crucial to consider several factors that impact both function and cost. The key considerations include filter capacity, ease of maintenance, energy efficiency, noise level, compatibility with UK home and garden conditions, and the overall value for money.
UK buyers often face unique challenges due to our climate and living spaces. Given the temperate nature of British weather, it is important to choose aquariums that can maintain stable water temperatures efficiently, particularly for tropical fish. Additionally, considering the typical small to medium-sized homes in the UK, space constraints are a significant factor when choosing an aquarium setup. The Aqueon Quietflow E and Interpet Bio CF1 both offer silent filtration, which is highly beneficial for households where noise might be a concern. However, the Aqueon model has a more compact design, making it easier to fit into smaller tanks or setups with limited space.
When comparing these filters across different price tiers—budget, mid-range, and premium—the cost structure often reflects not just the initial purchase but also ongoing maintenance expenses such as filter media and electricity use. Budget options tend to be more affordable upfront but may require frequent replacements of essential components and higher energy consumption. Mid-range filters like the Aqueon Quietflow E offer a balanced approach with better performance for a slightly higher price, while premium models like the Interpet Bio CF1 provide advanced features such as adjustable flow rates and longer-lasting filter media.
A common mistake UK buyers make is underestimating the importance of proper filtration in maintaining water quality. Both the Aqueon Quietflow E and Interpet Bio CF1 are designed to handle their respective tank sizes effectively, but it's essential to understand that overstocking or placing too many fish in a smaller tank can overwhelm even high-quality filters. UK buyers should ensure they have adequate space for the aquarium and follow recommended stocking guidelines based on the tank size.
Another critical aspect is compatibility with specific types of fish. While both filters are suitable for coldwater and tropical species, it's vital to research the particular needs of the fish you plan to keep. For instance, if you're housing sensitive species that require precise water conditions, features like adjustable flow rates and advanced biological filtration can be crucial.
Lastly, buyers should consider the manufacturer’s warranty and retailer’s return policy when making a purchase. While we do not offer any warranties or returns, it is important to understand that manufacturers typically provide limited warranties on their products. For instance, the Aqueon Quietflow E comes with a standard 12-month warranty from the date of purchase, while Interpet's Bio CF1 has a similar warranty period. Buyers should also familiarize themselves with Amazon’s standard returns terms, which allow for returns within certain periods if the product is faulty or not as described.
In conclusion, choosing between the Aqueon Quietflow E and Interpet Bio CF1 involves balancing features like silent filtration, capacity, maintenance requirements, and compatibility with your specific needs. By carefully considering these factors and understanding the broader context of UK market conditions and buyer behaviors, you can make an informed decision that best suits your aquarium setup and preferences.
The Nest & Yard editorial team
Written and reviewed by our UK-based team of home improvement and gardening writers, who research specs, pricing and customer reviews before every recommendation. Reviewed and updated on 2026-08-11.