If you use the water purifier again, you need to rinse it clean. If it doesn't work for only 3 days, rinse it for about 3-5 minutes.
If it exceeds 18 days or even longer, it needs to be rinsed for more than 15 minutes. There are also general water purifiers, which need to be cleaned once every few months.
Because some impurities will definitely be filtered out when filtering, we can't see them with the naked eye, but we can clean them with water.
On the other hand, water is also stained with water, so it is very necessary to clean it frequently.