The earliest water purification equipment in our country was bottled purified water. However, as our knowledge has increased and products have been constantly updated, there are many problems with bottled purified water. For instance, secondary pollution is inevitable. The secondary recycling of bottled water and the various technologies in the water treatment process do not meet the standards. These are the main reasons why the purified water is actually not pure. People usually keep changing the water buckets of bottled water repeatedly, but they ignore that there is still nearly 1000ML of water in the inner tank of the water dispenser, regardless of whether there is still water in the bucket or not.