Water treatment does not end the story. Discover what happens as drinking water moves through storage, distribution networks and building plumbing before reaching the tap.
A filtration technology can perform well in the laboratory. The more important question is whether it can operate reliably inside a real industrial process.
From late 2025 through April 2026, Klar2O and Ensinger Mineral-Heilquellen conducted a six-month pilot project integrating Klar2O filtration media into the process-water stream used for bottle cleaning at an Ensinger bottling facility.
Since 12 January 2026, new EU requirements for PFAS in drinking water have entered into application. For the first time, EU Member States must monitor PFAS levels in drinking water in a harmonised way and ensure compliance with the limits established under the recast Drinking Water Directive. [European Commission, New EU rules limit PFAS in drinking water, https://environment.ec.europa.eu/news/new-eu-rules-limit-pfas-drinking-water-2026-01-12_en] For water suppliers and companies involved in water treatment, this increases the importance of reliable PFAS analysis, appropriate filter-media selection and continuous monitoring. What are the new EU PFAS limits? The EU Drinking Water Directive defines two parameters for PFAS: The “Sum of PFAS” refers to a defined group of PFAS considered particularly
Water filters are designed to work under regular operating conditions. Water enters the system, moves through the filtration media, and leaves through the outlet. When a filter sits unused for days, weeks, or months, this process stops, but the filter does not become inactive in a neutral way. Inside the cartridge, water can remain trapped in the filter media, housing, pores, seals, tubing, or reservoir. This standing water is no longer the same as fresh incoming tap water. The CDC notes that germs can grow when water sits still inside water systems, and that filters and treatment systems can also allow germ growth if they are not maintained properly. This is
Drinking water testing is often treated as the main indicator of water safety. A sample is collected, a laboratory result is produced, and the water is judged based on that moment. Testing is important, but it does not always reflect how people are exposed to water every day. A water test captures a defined sample under defined conditions. Daily exposure is different. People drink water at different times, cook with it, prepare coffee or tea, fill bottles, use filtered and unfiltered outlets, and may consume different volumes depending on season, lifestyle, and household size. This means filtration should not only be designed around occasional results, but around real use. Point-of-use filtration
Water filtration is often discussed as if every contaminant can be treated separately. A filter is tested for lead, PFAS, chlorine taste, pesticides, microorganisms, or microplastics, and the result is usually presented as a specific reduction claim. In real water, however, contaminants rarely appear alone. Drinking water can contain a mixture of dissolved minerals, organic matter, particles, trace chemicals, disinfection by-products, metals, and emerging contaminants. This matters because filtration performance depends not only on the filter material, but also on what else is present in the water at the same time. A single contaminant in controlled testing is easier to evaluate. The system is exposed to a defined substance, under defined
Water filtration is often described as if performance depends only on the filter itself. The cartridge, membrane, carbon block, or filtration surface receives most of the attention. But filtration does not happen in isolation. It happens in real water, and real water has chemistry. The same filter can perform differently depending on the water it treats. pH value, mineral content, hardness, alkalinity, natural organic matter, temperature, and contaminant concentration can all influence how water moves through a system and how contaminants interact with the filtration media. This is why water chemistry is a critical part of filtration performance, not a secondary detail. pH is one of the most important factors. It
Water filters are usually judged by what they remove from water. If a system can reduce PFAS, microplastics, pesticides, metals, or other trace contaminants, the focus is often on the treated water that comes out of the filter. But there is another side to filtration that is easily overlooked: the contaminants do not disappear simply because they have been captured. In most filtration systems, contaminants are retained in the filter media. Activated carbon, ion exchange materials, membranes, and advanced filtration surfaces can trap or separate unwanted substances from water. The treated water may be cleaner, but the used cartridge now contains part of the contaminant load that was removed during operation.
Pre-filtration is often treated as a basic first step in water treatment. Because it usually targets larger particles such as sand, rust, sediment, and suspended solids, it can seem less important than advanced technologies designed for PFAS, microplastics, heavy metals, pesticides, or trace chemicals. In reality, pre-filtration plays a critical role in protecting the performance of the entire filtration system. Advanced filter media are designed to interact with specific contaminants. Activated carbon, membranes, ion exchange materials, and selective filtration surfaces all depend on controlled water flow and available active surface area. If the incoming water carries too many larger particles, those particles can block pores, cover active sites, increase pressure drop,
Water filters are often evaluated by the material inside the cartridge. Activated carbon, membranes, ion exchange resins, and advanced filtration surfaces all play an important role in contaminant reduction. But even the best filtration media can underperform if the water does not pass through it correctly. This is where filter bypass becomes critical. Filter bypass occurs when part of the water flows around the filter media instead of through it. This can happen because of poor sealing, incorrect cartridge fit, damaged O-rings, weak housing design, improper installation, pressure stress, or worn components. The result is simple but serious: untreated or only partially treated water can mix with filtered water. In many
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