Rank #3 in Best Aquarium Filter 2026: Turnover Is the Only Number
Interpet PF1 Internal Power Filter, for Aquariums Up to 68 Litre
Price and rating as shown on Amazon when we collected them. Both change.
The Interpet PF1 is the British staple with 2,752 ratings at 4.2 stars: £15.69, four stages of filtration, a stated tank size of 68 litres and a 7-watt pump.
It takes third because it works and people trust it, and fourth-best on data: it publishes the tank size and the wattage but not the flow rate, which is the number you need to calculate whether the turnover is enough.
How those 2,752 ratings break down
An average hides its own shape. This is the spread behind the 4.2 stars.
Specification
Exactly as published on the Amazon listing, field for field.
| Stated tank size | Up to 68 litres |
|---|---|
| Flow rate | Not published |
| Wattage | 7 W |
| Filtration | Four stages with flow control |
| Ratings | 4.2 from 2,752 |
| Price | £15.69 |
What buyers actually say
Quoted from customer reviews on Amazon
Verified purchase“Brilliant filter would buy it again well worth the money the flow on it is powerful”
Verified purchase“An absolutely fantastic filter one of the best I've bought easy to fit it's powerful reasonably quiet makes a slight hum but know louder than a refrigerator it's sturdy and is keeping my tank clean”
What it is up against
The rivals it was ranked against in Best Aquarium Filter 2026: Turnover Is the Only Number.
Rank #1
Fluval U2 Internal Aquarium Filter, Up to 110 Litres, 400 L/H Adjustable
£36.00
Rank #2
NICREW Magi700 Fish Tank Filter, 700 L/H for 60-150L Tanks
£19.99
Rank #4
NICREW Magi Mini Fish Tank Filter, 150 L/H for 20L Tanks
£13.99
Rank #5
NICREW Magi200 Fish Tank Filter, 200 L/H for 20-40L Tanks
£15.99
Questions people ask
What is its flow rate?
Not published. The listing gives a tank size and a wattage, and watts do not convert to litres per hour.
Is 7W enough?
For a tank up to 68 litres with light stocking, the model has years of reviews behind it; the wattage alone cannot answer the question.
How many stages?
Four, with directional and flow-rate controls.
Is it good for a first tank?
Yes: it is cheap, widely stocked in UK shops and easy to fit.
Why is it third?
Because it omits the flow rate, and the two filters above it publish both numbers.
How many ratings does it have?
2752 at the time of collection, averaging 4.2 stars, with 63 per cent five-star and 7 per cent one-star.
Comments
Reader comments are not checked against the manufacturer's claims above.
No comments yet
Be the first to add something we missed — a price change, a spec that turned out wrong, or how one of these held up.
Leave a comment
No account needed. Own one of these? Tell other readers how it actually performed.