British Berkefeld Stainless Steel Gravity Filter (Ultra Sterasyl) review
By Tom Calder
A genuinely well-made, NSF-certified ceramic gravity system that needs no power or plumbing and stores usable water on the worktop. It is a considered long-term purchase rather than a quick fix, and the cleanable candles keep running costs sensible over the years.
- Best for
- Households wanting mains-independent, plumbing-free drinking water at home or in an emergency.
- Skip it if
- You only want better-tasting everyday tap water
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Researched, not used. We haven't used this product. This review is built from the maker's specifications, owner reports and our own sizing.
What we like
- Sub-micron ceramic filtration that Doulton's own test data shows reducing bacteria and cysts by over 99.99% and lead by up to 95%, while leaving minerals in place
- Works entirely by gravity, so it keeps producing safe water during a power cut or supply interruption
- Ceramic candles can be scrubbed clean to restore flow between changes; Doulton advises replacing them every six months
- Stainless-steel build and made in the UK, so it is durable and easy to keep clean
Worth knowing
- Noticeably pricey next to a standard jug filter, and the outlay only makes sense if you value the resilience
- Gravity flow is slow and the candles need periodic scrubbing to keep the flow rate up
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Our review
The British Berkefeld is a stainless steel gravity filter made by Doulton in Staffordshire: an upper chamber drains through two Ultra Sterasyl ceramic candles into a lower chamber that holds 7.8 litres of filtered water, with no power or plumbing. It is a long-term purchase for a household that wants drinking water that keeps flowing in a power cut or supply problem, not a cheap jug.
What it is
Doulton lists the 8.5-litre system at 500 mm tall and 224 mm across, with a filtered water capacity of 7.8 litres, and two ceramic Ultra Sterasyl candles in the box. Smaller 6-litre and larger 12-litre versions use the same candles. Doulton suggests at least two candles for two people and four for a family of four or more, so a big household may want to add candles to speed the flow. The stainless steel body is rated for indoor or outdoor use.
What the candles do
Doulton's system page says the Ultra Sterasyl reduces bacteria, cysts, heavy metals, trace organics, pharmaceuticals and PFAS, and the candle page claims a 99.9 per cent reduction of microplastics under NSF/ANSI Standard 401, to which Doulton says the system is tested and certified by NSF. The system is also certified to NSF/ANSI/CAN 372, the lead-content standard for the materials. Doulton publishes test data for its other filters with higher percentages, but we could not find the Ultra Sterasyl's own figures on its site, so we quote only what the product pages claim.
Doulton makes no virus claim for this candle. That matters for flood water or a sewage-related boil water notice: a ceramic filter removes bacteria and cysts, but viruses are smaller. Follow your water company's instructions during a boil water notice, and treat the filter as one layer rather than the whole answer. Our guide to purifying water in an emergency explains how filters, boiling and tablets fit together.
Living with it
Doulton says to replace the candles every six months and, in areas with cloudy water, to clean them to restore the flow rate between changes. A soft brush under the tap does it. Doulton publishes no flow rate in litres per hour, so expect gravity to take its time and fill the top chamber before bed. Doulton also warns not to mix Ultra Sterasyl and Ultra Fluoride candles in one unit. Mains water in the UK is safe to drink as it comes, so day to day this is a taste and resilience purchase; our guide on whether UK tap water is safe covers that.
How it compares
On our gravity water filters page, the Berkefeld is the heavy, cleanable, British-made option. The cheaper plastic gravity systems and the Katadyn BeFree bottle use hollow-fibre membranes that cannot be scrubbed and are far smaller. A worktop jug filter improves taste but makes no claim against bacteria or cysts. For an emergency store, pair this with filled containers: the filter cleans water, it does not supply it.
Our verdict
A well-made, repairable, mains-independent filter for a household that wants to be able to make tap, stored or rainwater drinkable without power. Buy it if resilience is the point and you will change the candles on schedule. Skip it if you only want better-tasting tap water, where a jug does the job, or if viruses are your worry, where boiling or tablets are needed as well.
A researched review, built from the maker's specs, manual and UK listings; facts checked 2 Nov 2026. Sources: Doulton: British Berkefeld stainless steel gravity system, Ultra Sterasyl; Doulton: Ultra Sterasyl candle for the British Berkefeld; Doulton: test data.
Who shouldn't buy this
You only want better-tasting everyday tap water. UK mains water is already safe to drink, so a £30 jug filter does that job and this system is over-specified unless you specifically want off-grid or emergency resilience.
Key specs
| Capacity | 8.5 |
| Filter life | — |
| Filters | 2 x Ultra Sterasyl ceramic candles |
This is a Researched review: we haven't used this product. We check every specification against at least two independent sources, re-check the UK price on a schedule where we can track it automatically, and say plainly who it isn't for. Commissions never change a rating.
If this isn’t the one
Best for Households that want one worktop filter for everyday drinking water and supply resilience, with a membrane designed to block viruses as well as bacteria.
as of 2 Nov 2026, 16:07 GMT · Details
Product prices and availability are accurate as of the date/time indicated and are subject to change. Any price and availability information displayed on Amazon.co.uk at the time of purchase will apply to the purchase of this product.
Best for A family, or anyone who wants a bigger reservoir to stretch a power cut or supply interruption.
as of 2 Nov 2026, 16:07 GMT · Details
Product prices and availability are accurate as of the date/time indicated and are subject to change. Any price and availability information displayed on Amazon.co.uk at the time of purchase will apply to the purchase of this product.
Best for Mains-water households wanting better-tasting, safer drinking water with no plumbing work.
as of 2 Nov 2026, 16:07 GMT · Details
Product prices and availability are accurate as of the date/time indicated and are subject to change. Any price and availability information displayed on Amazon.co.uk at the time of purchase will apply to the purchase of this product.Questions
How much water does the British Berkefeld hold?
The 8.5-litre system holds 7.8 litres of filtered water in its lower chamber, per Doulton, and stands 500 mm tall.
How often do the Ultra Sterasyl candles need changing?
Doulton says every six months. Between changes they can be cleaned with a soft brush to restore the flow rate.
Does it remove viruses?
Doulton makes no virus claim for the Ultra Sterasyl. It claims bacteria, cysts, heavy metals, trace organics, pharmaceuticals, PFAS and microplastics. For water that may carry viruses, boil or treat it as well.
Is the British Berkefeld made in the UK?
Yes. Doulton makes the ceramic candles and the system in Staffordshire.
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