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Physical contaminants can be removed largely using basic pre-filtration techniques commonly used in many water purifiers. Biological contaminants can be removed using various technologies like UV, ozonation, ultrafiltration, biocidal resins and allied materials. However, a key challenge is removing the dissolved chemicals/solids due to its size and complex nature. While activated carbon can remove some organic chemicals and chlorine, it cannot remove heavy metals and pesticides effectively.