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Image of a Doulton Countertop system with a ceramic filter inside.

Doulton® Filters for Pressure Systems

Selection of the most appropriate grade of candle allows filter performance to be matched to the requirements of the local water conditions.

 

Ultracarb® BioTect Ultra®

Sterasyl®
microfilter plus carbon block core and lead
removal media

Sterasyl® microfilter plus carbon block core & heavy metals with lead removal media

Filtration Rating

(% particulate filtration efficiency)

          Absolute (defined as > 99.99% )

          Nominal (defined as >99.99%)





0.9 micron

0.5 to 0.8 micron





0.9 micron

0.5 to 0.8 micron

Working Pressure (for pressure filter use)

          Minimum

          Maximum



10 psi

125 psi



10 psi

125 psi

Working Parameters

          Working temperature range

          Working pH range

          Suitable for use in Gravity filter systems

          Recommended change frequency



5 – 30 (°C)

5.5 – 9.5

No

6 months



5 – 30 (°C)

5.5 – 9.5

No

6 months

Flow Rate
Unrestricted Flow at 3 Bar Pressure up to

          Litres per minute
          US gallons per minute

To achieve maximum performance

          Litres per minute
          US gallons per minute




3.3
0.9



1.9
0.5




3.3
0.9



1.9
0.5

Capacity
Before replacement to guarantee performance

          Litres
          US gallons




2300
600




2300
600

Quality Approval

          WRAS (Water Regulations Approval Scheme)

          Turbidity reduction



Yes

>98%



Yes

>98%

Pathogenic Organisms
Bacteria Removal*

          E. Coli / Shigella / Typhoid / Klebsiella Terrigena

% Cyst Removal

          Cryptosporidium
          Giardia




>99.99%



>99.99%
>99.99%




>99.99%



>99.99%
>99.99%

Trace Organics Removal
Range of Pesticides+

     Insecticides
          Lindane @ 0.1ppb presence

     Herbicides
          Atrazine @ 1.2ppb presence

     Phenols
          TCP @ 1.2ppb presence

     Polyaromatic Hydrocarbons
          PAHs @ 0.2ppb presence

     Trihalomethanes
          Chloroform @ 150ppb presence





>85%


>85%


>50%


>95%


>50%





>85%


>85%


>50%


>95%


>50%

Enhanced Organics Removal
Pharmaceuticals+

     Lindane
          @ 2ppb presence

     Atrazine
          @ 9ppb presence

     Benzene
          @ 15ppb presence





N/A


N/A


N/A





Ave 70%


Ave 90%


Ave 87%

Inorganics Removal
Free Chlorine Removal

          2ppm presence to NSF Class 1 Std 42




94.2%




† >96%

Monochloramine Reduction

          3ppm presence

          2ppm presence



N/A

N/A



N/A

Ave 64%

Heavy Metals Removal

     Lead reduction pH6.5
          @ 150ppb presence to NSF Std 53

     Lead reduction pH8.5
          @ 150ppb presence to NSF Std 53

     Mercury reduction pH6.5
          @ 6ppb presence

     Cadmium reduction pH 6.5
          @ 30ppb presence




97.3%


99.5%


N/A


N/A




98.9%


†99.1%


Ave 90%


Ave 95%

Please note:

  1. This product is classed as a pesticidal device due to its filtration claims, individual state legislation may limit the availability of certain products, please check state law.
  2. +Internally generated test data.
  3. *Ceramics tested in HIS filter housing with a minimum of 5 log/100mls influent change.

 

 

Image of a British Berkefeld Gravity System with a ceramic filter on show.

British Berkefeld® Filters for Gravity Systems

Selection of the most appropriate grade of candle allows filter performance to be matched to the requirements of the local water conditions.

Ultra Sterasyl® Ultra Fluoride®

Sterasyl®
microfilter plus granular activated carbon and lead
removal media

Sterasyl® microfilter plus Fluoride and lead removal media with activated carbon

Filtration Rating

(% particulate filtration efficiency)

          Absolute (defined as > 99.99% )

          Nominal (defined as >99.99%)





0.9 micron

0.5 to 0.8 micron





0.9 micron

0.5 to 0.8 micron

Working Parameters

          Working temperature range

          Working pH range

          Suitable for use in Gravity filter systems

          Recommended change frequency



5 – 30 (°C)

5.5 – 9.5

Yes

6 months



5 – 30 (°C)

5.5 – 9.5

Yes

6 months

Flow Rate
To achieve maximum performance

          Litres per hour
          US gallons per hour




1.2 under gravity
0.3 under gravity




1.2 under gravity
0.3 under gravity

Capacity
Before replacement to guarantee performance

          Litres
          US gallons




1500
400




1500
400

Quality Approval

          WRAS (Water Regulations Approval Scheme)

          Turbidity reduction



Yes

>98%



Yes

>98%

Pathogenic Organisms
Bacteria Removal*

          E. Coli / Shigella / Typhoid / Klebsiella Terrigena

% Cyst Removal

          Cryptosporidium
          Giardia




>99.99%



>99.99%
>99.99%




>99.99%



>99.99%
>99.99%

Trace Organics Removal

Range of Pesticides+



>95%



N/A
PFOA & PFOS
Combined removal efficiency

          1.5ppb to less than or equal to 0.07ppb



95%



N/A

Enhanced Organics Removal

          Pharmaceuticals+
          Lindane @ 2ppb presence
          Atrazine @ 9ppb presence
          Benzene @ 15ppb presence



>99.5%
>99%
99.38%
>99%



NO DATA
NO DATA
NO DATA
NO DATA

Inorganics Removal
Free Chlorine Removal

          2ppm presence to NSF Class 1 Std 42




>99% under gravity




Ave 97.2%

Heavy Metals Removal

     Lead reduction pH 6.5
          @ 150ppb presence to NSF Std 53

     Lead reduction pH 8.5
          @ 150ppb presence to NSF Std 53

     Mercury reduction pH 6.5
          Ave 6ppb presence

     Arsenic reduction pH 6.5
          Ave 47ppb presence

     Barium reduction pH 6.5
          Ave 9834ppb presence

     Chromium reduction pH 6.5
          Ave 339ppb presence

     Selenium reduction pH 6.5
          Ave 102ppb presence

     Range of Metals pH 6.5
     Range of Metals pH 8.5




Ave 99.5%+


Ave 99.5%


N/A


N/A


N/A


N/A


N/A

81.5%
81%




Ave 95%


N/A


Ave 86.4%


Ave 97.4%


Ave 90%


Ave 99.4%


Ave 93.7%

N/A
N/A

 

Please note:

  1. This product is classed as a pesticidal device due to its filtration claims, individual state legislation may limit the availability of certain products, please check state law.
  2. +Internally generated test data.
  3. ^Tested as Hexachlorobenzene

Test Data Explained

What does the term "Filtration Rating" refer to?

When considering a water filter, you'll probably note that each filter is equipped with a micron rating, as highlighted in the technical specifications.

According to Sciencenotes.org, a micron is a unit of length that is one millionth of a meter or 10-6 m. One micron is 1/26,000 of a inch. The micron is also known as a micrometer (American), micrometer (International Bureau of Weights and Measures), or by its abbreviation μm. 

The micron or micrometer is used to describe sizes of very small objects. An object measuring just one micron across is only visible through magnification, such as a microscope, whereas objects with a thickness of 10 microns are barely perceptible without magnification. Typically, particles in the 50-to-60-micron range are visible to the naked human eye.

Here are a few examples:

  • 1-10 μm - Length of Bacteria
  • 17-181 μm - Diameter of human hair
  • 70-180 μm – Thickness of a sheet of paper

So why is a filtration rating important for water filters?

The micron rating of a water filter denotes the size of the spaces between its filtering components, determining what contaminants can be filtered out. For instance, if your water contains particles sized at 5 µm and your entire home's water filter has a micron rating of 5 µm, it will efficiently remove those sediments and anything larger. However, if the sediment filter's micron rating exceeds 5 µm, these troublesome particles will evade filtration, entering your home and possibly posing risks to health and causing damage.

What are the different Water filter micron sizes and their filtering capabilities?

0.5-micron:

Referred to as ultra-fine filters, 0.5-micron filters excel at filtering most bacteria, cysts, protozoa, and other contaminants as small as 0.5 microns. They effectively target larger entities like Giardia lamblia and Cryptosporidium, known to cause gastrointestinal issues.

1-micron:

Filters with a 1-micron rating can successfully reduce numerous bacteria and parasites, including E. coli, Salmonella typhimurium, Shigella dysenteriae, and other certain viruses. The pore structure offers sufficient safeguarding against harmful contaminants commonly found in public drinking water sources.

5 microns:

Primarily designed for sediment removal, 5-micron filters are well-suited for whole-house filtration systems that require rapid filtration of large water volumes without compromising efficiency. While they provide some defense against larger organisms such as Giardia lamblia and cysts, they may not be effective against smaller pathogens like E. coli. Hence, it's advisable not to rely solely on 5-micron filters for combating bacterial contamination.

10 microns:

Although 10-micron filters may eliminate certain invisible particles from water, they are not effective against bacteria or viruses. Nevertheless, their minute size proves advantageous across various industries, from oil to chemical facilities, due to their extended filter life and slightly improved flow rates. However, like filters with lower micron ratings, 10-micron filters are prone to clogging.

Considering that many micro-organisms and cysts, while in their dormant stage, have a size exceeding 1 micron, Doulton® & British Berkefeld® ceramic water filters will effectively obstruct their passage through physical filtration.

What are Absolute and Nominal Micron Ratings?

Absolute Micron Rating:

What is meant by an absolute rating is the maximum size of particles that can pass through a filter. For instance, a 1-micron absolute filter is designed to block anything larger than 1 micron from passing through.

Nominal Micron Rating:

In contrast, a nominal filter provides more of an estimate than a precise assurance regarding the particle size that can pass through. This is because some of the pores or openings in the filter surface might be larger than the rated size, allowing a certain percentage of particles matching the micron rating to pass through.

What does Working Pressure mean in water filtration?

Water pressure occurs as water moves through various components such as filter systems and pipework. It enables us to determine the flow rate of water for our filters under the current working pressure.

What is the meaning of Flow Rate?

Water filtration equipment is usually dimensioned based on its flow rate, indicating the volume of water it can handle at any given moment. This measurement is commonly stated in litres or gallons per minute.

How to measure a Flow Rate?

Discovering your kitchen tap's flow rate is quite straightforward. All you require is a stopwatch and either a bucket or a one or two-litre jug! Simply open the cold water tap and measure the volume of water flowing through it in litres or gallons per minute.

What is the significance of quality approval and how is it explained?

Quality approval for water filters is of paramount importance for several reasons:

  • Health and Safety: Water filters are designed to reduce impurities, contaminants, and pathogens from water, ensuring that it is safe for consumption. Quality approval ensures that the filter effectively reduces harmful substances, safeguarding public health and preventing waterborne diseases.
  • Reliability: Approval from recognised quality control agencies or regulatory bodies verifies the reliability and performance of water filters. Consumers can trust that the filter will consistently deliver clean and safe drinking water as promised.
  • Compliance: Quality approval often involves adherence to specific standards and regulations set by governmental or international organisations. Compliance with these standards ensures that the water filter meets minimum requirements for safety, quality, and environmental protection.
  • Product Reputation: Approval from reputable organisations enhances the reputation of the water filter manufacturer. It demonstrates a commitment to quality and consumer safety.
  • Legal Obligations: In many regions, manufacturers are legally required to obtain quality approvals
    for products like water filters before they can be sold to consumers.
  • Performance Assurance: Quality approval typically involves rigorous testing procedures to evaluate the
    performance of water filters under various conditions. This testing ensures that the filter operates effectively over its lifespan, providing consistent water quality.
  • You Can Be Confident: Knowing that a water filter has undergone quality approval. You can feel assured that the filter has been thoroughly tested and verified by independent or internal experts, reducing uncertainty about its effectiveness.

In summary, quality approval for water filters is significant for ensuring public health and safety, verifying product reliability and compliance, maintaining a positive reputation, fulfilling legal requirements, and inspiring consumer confidence.

What are Pathogenic Organisms?

A pathogenic organism is defined as an organism with the capacity to induce illness in a host. These organisms encompass various types such as bacteria, viruses, or cysts, all capable of instigating diseases like typhoid, cholera, and dysentery.

What are Trace Organics?

Trace organics refer to organic compounds present in minute concentrations in various substances, such as water, soil, air, and biological tissues. These compounds can originate from natural sources or be introduced into the environment through human activities such as industrial processes, agriculture, and waste disposal.

In environmental science and chemistry, the term "trace organics" often specifically refers to organic pollutants or contaminants that are found in very low concentrations but can still have significant impacts on ecosystems and human health due to their toxicity, persistence, and bioaccumulation properties. These compounds include pesticides, pharmaceuticals, industrial chemicals, and by-products of combustion.

What are Enhanced Organics?

Enhanced organics are organic materials that have been changed or improved to make them better for specific uses. This can involve chemical changes, physical alterations, surface treatments, nanotechnology, or biological modifications.

Organic contaminants fall into two primary categories: Volatile Organic Compounds (VOCs) and Total Organic Carbon (TOCs). VOCs consist of solvents, hydrocarbons, alcohols, and various industrial compounds. TOCs encompass all-organic carbon compounds, such as decaying plant and animal matter. Elevated TOC concentrations may be present in certain surface water sources (streams, rivers, lakes, reservoirs, etc.), but it tends to be less prevalent in groundwater sources.

Carbon filtration stands as an effective method for eliminating the majority of organic contaminants.

What are Inorganics?

Inorganic substances are chemicals without carbon, like ammonia, hydrogen sulphide, metals, and elements such as calcium.

The primary focus in most cases of removing inorganic contaminants involves reducing sediment or particles. This entails eliminating particles suspended in water or fluid before it can be utilised for its intended purpose. These particles may vary in visibility, ranging from those observable by the naked eye to those requiring magnification. Typically, particles smaller than 40 microns are imperceptible to most individuals (with 1 micron equating to one-thousandth of a millimetre or 1/1000 mm).

To provide a comparison of sizes, common particles and substances are outlined below:

  • Dust: Up to 1 micron
  • Cement dust: 3 to 4 microns
  • Human red blood cell: 5 microns
  • Pollen: 7 to 10 microns
  • Silt: 10 to 75 microns
  • Diameter of a human hair: 100 microns
  • Sand: 75 to 1000 microns

What is Monochloramine?

Chloramination is a vital step in ensuring the safety and cleanliness of our drinking water. It involves the addition of chloramine, a compound containing both chlorine and ammonia, to effectively disinfect water and eliminate harmful germs. This method serves as an alternative to chlorination, offering its own set of advantages in water treatment processes.

Now, let's delve deeper into monochloramine, the specific type of chloramine used in drinking water disinfection. Monochloramine is meticulously mixed into water at precise levels to strike a balance: it effectively eliminates germs and pathogens, ensuring the water is safe for consumption, while still maintaining its safety for human consumption.

What sets monochloramine apart is its stability and long-lasting disinfection properties. Unlike free chlorine, which can dissipate relatively quickly, monochloramine persists in the water distribution system, providing a continuous barrier against microbial contaminants. This longevity ensures that water remains safe as it travels from the treatment plant to your tap.

Furthermore, monochloramine's effectiveness extends beyond just disinfection. It also helps control the formation of disinfection by-products (DBPs), which can pose health risks in their own right. By utilising monochloramine, water treatment facilities can mitigate these risks while maintaining the highest standards of water quality.

In summary, chloramination, particularly through the use of monochloramine, plays a crucial role in safeguarding the health and well-being of communities by ensuring access to clean, safe drinking water.