The device comes without a water tank and includes a five-stage water filtration system. This system uses a high-performance reverse osmosis membrane.  The membrane contains microscopic pores that allow pure water to pass through while retaining dissolved minerals and contaminants. In terms of device maintenance, this product features an easy twisting mechanism allowing you to take out the filter and replace it with the new one, without having to move or uninstall the device. This device uses multi-filtration technology to increase its efficiency. This helps to avoid blockages in the filter membrane and extends the lifespan of the device while keeping a high level of water quality and consistent taste.