Coldstream Sentry Gravity Water Filter System | Portable Water Filter UK
Coldstream Sentry Gravity Water Filter System


Coldstream Sentry Portable Gravity Water Filter System with 4 Filters


  •  Simply the best and most cost effective portable gravity filter on the market today​
  •  Supplied with four powerful 2.9" x 8" Coldstream Ceramic Filters
  •  Comes with a high quality and durable stainless steel tap
  •  Reduces sodium fluoride to high levels 97% (see test data) without any additional filters
  •  The best buy of all and MADE IN THE UK
  •  Reliable - Simple - Effective

About Coldstream

Coldstream have set out to make the very highest standard drinking water filters, capable of providing you with clean, safe drinking water that tastes great straight from the tap, or direct from a gravity fed supply anywhere in the world.... and they've succeeded admirably.

This has been achieved by means of Coldstream’s unsurpassed technical understanding of water filtration techniques and material performance, their comprehensive system and filter testing and manufacturing quality assurance and using unique high performance ceramics made using their own hi tech manufacturing processes at their renewable energy powered and efficient manufacturing facility in King’s Lynn in the UK. Their team of technical experts are some of the most experienced in their field, creating and delivering solutions in countries all around the world.

"The difference in the taste of the water is astonishing - sparkling clear - 'alive' looking and clean, clear tasting, the way water SHOULD taste and we are far more inclined now to go get a glass of water." D.L


General Features and Specifications

Coldstream Sentry Gravity Filter

  • Unique high performance ceramic cartridges​
  • Filter candles can be cleaned and re-used
  • Gravity fed water filter
  • Easy install
  • Renewable Energy powered manufacture
  • Metal tap


The Coldstream Sentry Gravity Water Filter System is fast establishing itself as the premium gravity filter on the market. Coldstream have taken all the product flaws with other leading filter products and solved them through their innovative approach. Here is a summary of what makes them different and better:

1) Rubber - The Coldstream system has 4 filters which eliminates the need for the rubber grommet which has been the cause of both complaint (because of the rubbery taste) and failure (because of the grommets having defects which allow unfiltered water too pass through - which is a massive issue especially when considering usage on raw untreated water supplies). Therefore, for this reason, Coldstream and better and more reliable and having four filters massively improves the flow rate, making production much faster. Of course you can add up to 4 filters in competing products but these do not come as standard.

2) Powerful Filters - The Coldstream filters are extremely powerful at filtering. They are even able to reduce fluoride (up to 97% - see test results). Doulton Super Sterasyl, Doulton ATC Super Sterasyl and Black Berkey Filters do not reduce fluoride on their own, so you have to add extra filters (the PF4's for the Doultons and the PF-2's for the Black Berkey Filters). This is a problem because they screw onto the end of the main filters and take up space in the filtered water chamber. They are also made of plastic so the plastic is then sitting in your filtered water, not nearly as good as Coldstream who have solved it through their more advanced filtering technology.

3) Fluoride Removal - the other very important aspect of the Coldstream filters is that they reduce fluoride without using Activated Alumina which exchanges fluorides with aluminium hydroxide. Coldstream use micro-ceramics to achieve this without migrating materials into the water through exchange making them far superior to older fluoride reduction technology.

3) Stainless Steel Tap - The Doulton (British Berkefeld) and Big Berkey all have a plastic tap which is nowhere near as strong and durable as the stainless steel tap which comes as standard with the Coldstream system. This tap will provide years of trouble free service and is sturdy and reliable.

coldstream sentry gravity water filter system

Superior Flow Rate and Filter Volume

The Coldstream filters are 1" longer and nearly 1" wider and therefore not only contain more filter media resulting in superior filtration, but also much faster flow rates. See how the filters compare in size to the Doulton Gravity Filters


Filter Performance Data

The following test report shows the average results tested for a vast array of contaminants:

The following test report is specifically for the filters performance with micro-organisms:

Download the set up manual:


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Model Coldstream Sentry Gravity Water Filter System with 4 Filters
Brand Coldstream
In Depth Housing Info:

Dimensions: Assembled 8" x 19" / Stored 8" x 13.5"
Upper Reservoir Holds 8 liters of Untreated Water
Lower Reservoir Holds 8 liters of Treated Water

Contaminant removal:

• Bacteria removal (E.coli / Cholera / Shigella / Typhoid / Klebsiella Terrigena) - 99.9999%
• Cyst removal (Cryptosporidium / Giardia) - 99.9999%
• Volatile Organic Contaminants – 94% - 99%
• Lead, Cadmium, Selenium, Zinc removal – 100%
• Heavy Metal Contaminants (to NSF 53c) – 97%
• Pesticide Contaminants – 99.9%
• Herbicide Contaminants – 99.9%
• Free Chlorine Removal (Chlorine Taste and Odour) – 99.9%
• Chloromine Removal – 99.9%
• Fluoride removal – 97.0%


• Flow Rate – 1.0 L/hr
• Operating Temperature - min 5°C / max 30°C
• Service Life - 6 months (recommended)

Critical Dimensions

• Diameter – 2.9”
• Length – 8.0”
• Fitting type – ¼” BSP
• Fitting length – LM (26mm)

Coldstream Sentry Gravity Water Filter System


  •  The best gravity filter on the market today
  •  Come with four powerful 2.9" x 8" Coldstream Ceramic  Filters
  •  Comes with a high quality and durable stainless steel tap                                          
  •  Reduces sodium fluoride to high levels 97% (see test  data) without any additional filters      
  • The best buy of all and MADE IN THE UK
  • Views: 2318
  • Product Code: Coldstream Sentry
  • Availability: In Stock
  • £225.00
  • Ex Tax: £225.00

Available Options

Tags: Fluoride Removal, Stainless Steel, Metal Tap, Gravity Fed, Ceramic Cartridges, Easy Install