The downside to all that space is that this jog won’t fit in your fridge door or even on the shelf of a large American-style fridge freezer. We particularly appreciated the contoured handle that allowed for a comfortable and sure grip, and also liked the thumb-operated slide-away lid panel, which allows for filling without removing the lid. The Biocera alkaline did have the slowest filtration time out of the jugs we tested at a rather sedate 9 minutes per litre. If you created your account or joined the Cylinder Loop service before 28th July 2023, please go to “Activate Account” tab instead. Both are made in close collaboration with BWT, one of the world’s leading water technology companies.

It can also safely go in your dishwasher without getting scratched, which helps prevent microbiological growth. They come in four different shapes, creating a playful design concept with both unity and individuality. Developed in collaboration with BWT, one of the world’s leading water technology companies, it’s made from glass and stainless steel to be more sustainable.

With a capacity of nearly three litres and a filter time of just 1 min and 40 secs per litre, this roomy jug will meet the daily needs of a thirsty family. We liked the digital countdown indicator in the lid that tells you when the filter needs replacing, and at just 58 seconds per litre, the Klar was the fastest filter jug on our list. What the maker does claim, however, is that the jug “remineralises” the water, adding zinc, selenium, magnesium and potassium, giving it a “signature Klar mineral water taste”.

The easy-to-read mechanical dial built into the lid shows when you need to replace the filter, while the flip-up lid made it easy to fill the jug from the tap, and the comfortable handle meant it was easy to pour. Our testing didn’t extend to verifying those claims, but we can say that all the jugs we tested did noticeably improve the flavour of the water that came out of our tap.

But, overall, the quality material and thoughtful design made the jug worth the extra time and expense. Developed to work perfectly with Aarke carbonators, the brand’s Flavour Drops come in a variety of flavours, like sweet Wild Strawberry and refreshing Cucumber and Lime. Each jug in this round-up had its own filter reminder system, ranging from a simple manually adjustable sliding scale built into the lid, to an LED sensor and even free downloadable apps. The precisely tuned carbonation system ensures the perfect bubble size while keeping CO2 use to a minimum, so each gas cylinder lasts longer, and models are now fitted with even higher quality sustainable parts to withstand the test of time. Its traditional waisted design, however, means it won’t look out of place on the Sunday lunch table, and you can always plan ahead and make a batch of filtered-water ice cubes to plonk into the jug later.