Which water treatment classification filters water but does not perform chemical treatment?

The classification that filters water without conducting chemical treatment is WT1. This classification is primarily concerned with the physical processes involved in water treatment, specifically filtration. In WT1 facilities, the focus is on removing suspended solids, sediment, and other particulate matter from the water through various filtration methods, such as screen filtration or sand filtration.

Unlike higher-level classifications, WT1 does not involve processes that alter the chemical properties of the water, such as coagulation, disinfection, or advanced treatment methods that introduce chemicals to remove or neutralize contaminants. This makes WT1 suitable for simpler water treatment systems where water quality primarily relies on physical removal of impurities rather than chemical modification.

In higher classifications (WT2, WT3, WT4), there is an increasing complexity involving chemical treatments to address various contaminants. Therefore, WT1 is distinctly recognized for its role in purely physical filtration processes, highlighting its focus and functionality within the water treatment spectrum.