In terms of technical principles, countertop water purifiers typically employ a multi-stage filtration system comprising pre-treatment, core filtration, and post-treatment stages. The pre-treatment stage primarily removes large particulate impurities-such as sediment and rust-to protect downstream filter cartridges from damage. The core filtration stage utilizes advanced technologies like reverse osmosis, ultrafiltration, or nanofiltration to thoroughly remove bacteria, viruses, heavy metal ions, and dissolved organic matter. Finally, the post-treatment stage uses materials such as activated carbon to further adsorb odors and residual chlorine, thereby improving the water's taste.
