Best Aquarium Filters & Pumps — Up to 100 Litre (2026)
1 aquarium filters & pumps matching capacity “Up to 100 Litre”, hand-picked from UK Amazon listings.
Not sure which one to pick? Read our How to Care for & Maintain Your Aquarium Filters & Pumps guide.
Maintaining a healthy environment for your smaller aquarium is crucial, and choosing the right filter and pump combination is key. This selection focuses on units designed to effectively process water volumes up to 100 litres – ideal for nano tanks, community fish setups, or quarantine systems. These filters and pumps provide essential mechanical, chemical, and biological filtration, ensuring clear water and a thriving ecosystem for your aquatic inhabitants. Careful consideration of flow rate and noise levels is important when selecting the appropriate unit for your specific needs; larger units may generate more noise than smaller ones.
#1 Pick
JBL CristalProfi i100 greenline, Internal Filter for Aquariums up to 100 Litres- Up to 100 Litre
£51.89
Pros
- Greenline energy-saving design keeps running costs low for an internal filter
- Multi-chamber media basket handles mechanical and biological filtration in one unit
- From a long-established German aquatics brand with wide parts availability
Cons
- Still a newer listing with only a handful of reviews so far
FAQ
What kind of fish are suitable for a 100 litre aquarium?+
Generally, smaller community fish like Neon Tetras, White Cloud Mountain Minnows, and Guppies thrive in a 100-litre tank. Avoid overly large or aggressive species that require significantly more space.
How often should I clean the filter media?+
The frequency of cleaning depends on your stocking levels and water quality. Typically, you’ll need to clean mechanical filter media (like sponges) every 1-2 weeks, while biological media should be left undisturbed to maintain its beneficial bacteria colonies.
What type of pump flow rate do I need?+
For a 100 litre tank, a pump with a flow rate of around 60-80 litres per hour (LPH) is generally recommended. This provides sufficient circulation and water movement without overwhelming the biological filter.
Do I need to prime the filter?+
Yes, most submersible filters require priming before initial use – filling the pump housing with water to displace air. Follow the manufacturer’s instructions carefully; some pumps may also require occasional priming after being drained.
Can I add chemicals to this type of filter?+
While you can use chemical treatments for water conditioning or medication, avoid adding them directly into the filter unless specifically instructed by the product's guidelines. Some chemicals can harm beneficial bacteria.
What is the noise level like with these filters?+
The noise levels vary depending on the pump’s design and speed. Look for pumps described as ‘silent’ or ‘low noise’ if minimizing disturbance is a priority, especially if your aquarium is in a living room.
How do I install the filter and pump?+
Most filters attach magnetically to the side of the tank glass, while the pump sits on the bottom. Ensure all connections are secure before starting the pump to prevent leaks or instability.
What’s the best filter media for a 100 litre aquarium?+
A combination of mechanical, chemical and biological filtration is ideal. This typically involves sponges for mechanical filtration, activated carbon for removing impurities, and ceramic rings or bio-balls for supporting beneficial bacteria.
How do I maintain the pump’s performance?+
Regularly check the impeller to ensure it's free from debris and functioning correctly. Clean any obstructions with a soft brush and adjust the flow rate as needed to maintain optimal water circulation.
What if the filter stops working?+
First, check that the pump is plugged in and receiving power. If it’s still not working, consult the manufacturer's instructions for troubleshooting, or refer to Amazon’s standard returns policy for assistance with potential faults.