How Our Whole Home Water Filtration Technology Works
Why Cartridge-Less Filtration Is Used Around The World
Across North America, Europe and many parts of Asia, cartridge-less carbon filtration systems are widely used for whole home water treatment. Often referred to as granular activated carbon (GAC) systems, they prioritise higher filtration capacity, longer service life and reduced plastic waste compared with small cartridge filters.
We’re bringing this globally trusted approach to Australian homes.
Proven
Infrastructure
The same carbon filtration technology used in many cartridge-less carbon filtration systems is also used in major water treatment plants such as New York City’s Croton Filtration Plant and London’s Hornsey Water Treatment Works.
Scale
Understanding Why Cartridge-Less Filtration Is Used
Around The World
Our cartridge-less systems use controllers manufactured by Pentair, a global water technology company founded in 1966 in the United States. Pentair develops equipment used in residential, commercial and municipal water treatment systems worldwide. The company also owns the well-known Fleck control valve brand, originally developed in the U.S. in 1950 and widely used by water treatment professionals today.
Key components are also supplied by BWT (Best Water Technology), one of Europe’s largest water treatment companies. BWT traces its origins back to 1823 and manufactures water treatment systems across Europe with production sites in Austria, Germany, France and Switzerland.
Because both companies are large, established manufacturers with global distribution networks, replacement parts and service components are widely available through water treatment suppliers worldwide. This helps ensure long-term reliability and ongoing parts support for systems built using their technology.
BWT is also widely recognised through its partnerships in international motorsport, including its title partnership with the BWT Alpine Formula 1 Team (formerly Renault F1). These partnerships reflect the company’s focus on engineering, innovation and sustainable water technology.
In many countries, whole-home water treatment evolved toward large carbon media tanks rather than small replaceable cartridges. Small cartridge filters contain relatively small amounts of filtration media, which means they require frequent replacement when used to treat water for an entire home.
By comparison, cartridge-less carbon filtration systems contain much larger volumes of activated carbon media. The carbon media itself is commonly known as granular activated carbon (GAC), which the Water Quality Association notes has been widely used in drinking water treatment since the early 1900s.
Large carbon media filtration systems are commonly paired with periodic backwashing to maintain performance. Municipal systems such as New York City’s Croton Water Filtration Plant include dedicated backwash infrastructure, while London’s Hornsey Water Treatment Works includes wash water recovery systems designed specifically for carbon media cleaning cycles. These design principles explain why large carbon media filtration systems became widely adopted internationally for municipal, commercial and residential water treatment. (Sources: Water Quality Association GAC Fact Sheet; NYC Department of Environmental Protection; Thames Water Infrastructure Documentation).
In the United States, home water filtration is already mainstream. The Water Quality Association’s 2021 Consumer Opinion Study reports that about 50% of American households rely on either bottled water or home treatment systems for drinking water, including 32% that rely specifically on home treatment systems. With roughly 129 million households in the United States according to the U.S. Census Bureau, this means approximately 41 million American homes already rely on water treatment systems in the home. (Sources: Water Quality Association Consumer Opinion Study 2021; U.S. Census Bureau QuickFacts).
Whole-home filtration systems in the U.S. often use larger cartridge-less carbon filtration systems because American homes commonly have multiple bathrooms, high water usage and higher flow requirements than point-of-use filters can support. The filtration media used in these systems is commonly known as granular activated carbon (GAC). According to the Water Quality Association, GAC filtration has been widely used in drinking water treatment since the early 1900s and remains one of the most established technologies for reducing chlorine, taste, odour and organic contaminants in drinking water. (Source: Water Quality Association GAC Fact Sheet).
Across Europe, activated carbon filtration is widely trusted in both municipal infrastructure and residential water treatment systems. Germany, for example, supplies drinking water to more than 80 million residents, and advanced treatment technologies such as activated carbon adsorption are commonly used to improve water quality and remove organic contaminants. (Source: German Federal Environment Agency – Drinking Water Reports).
One of the clearest infrastructure examples is London’s Hornsey Water Treatment Works, which uses catalytic granular activated carbon filtration as part of its treatment process. The plant operates with eight catalytic GAC adsorption filters and produces approximately 50 million litres of drinking water per day. Engineers selected this technology after evaluating alternatives including reverse osmosis and ion exchange because catalytic carbon filtration provided the best balance of treatment performance and whole-life operating cost. (Source: Thames Water / Water Projects Online Hornsey WTW Case Study).
Because carbon filtration technology was already widely trusted in European municipal infrastructure, larger cartridge-less carbon filtration systems became a common approach for whole-home water filtration in many parts of Europe.
Many countries have increasingly adopted cartridge-less carbon filtration systems partly because they reduce long-term plastic waste compared with frequently replaced cartridge filters.
Typical residential cartridge filters are replaced every 3–12 months depending on water usage. When multiplied across tens of millions of homes worldwide, this creates a significant volume of plastic waste entering landfill each year. Larger carbon media systems instead use a single filtration tank containing loose carbon media that can operate for several years before the media requires replacement.
Environmental research has also highlighted concerns around microplastics and plastic pollution in water systems. A study published in Science of the Total Environment found that granular activated carbon can effectively adsorb nanoplastics and other contaminants from water, which is one reason carbon media filtration continues to be widely used in water treatment. (Science of the Total Environment – Activated Carbon Adsorption of Nanoplastics).
The filtration media used in many cartridge-less carbon filtration systems is commonly referred to as granular activated carbon (GAC). One of the most important factors affecting filtration performance is contact time, which refers to how long water remains in contact with the carbon media.
Peer-reviewed research shows that longer contact times significantly improve contaminant removal. A study published in the journal Water evaluated granular activated carbon filtration columns and found that systems operating with an 18-minute empty bed contact time achieved significantly higher removal of organic micropollutants compared with systems operating with only 6-minute contact times. (Water Journal – Granular Activated Carbon Contact Time Study).
This is one reason larger carbon media tanks became common internationally for whole-home filtration. Larger media beds allow longer contact times and deeper filtration compared with small cartridge filters that contain relatively small amounts of carbon media. Research reviews from the U.S. National Research Council also identify activated carbon adsorption as one of the most effective technologies for removing chlorine, organic compounds and taste- and odour-causing contaminants from drinking water. (National Research Council – Drinking Water and Health Review).
We noticed an immediate difference in the taste and smell. The whole process was smooth and well-organised, and it’s reassuring to know we’re using a system that will protect our home and appliances for years.
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