What is the reason why the waste water does not flow when the kitchen water purifier is not in use?

The water purifier is divided into ultrafiltration water purifier and reverse osmosis water purifier, the biggest difference between the two is that the filtration accuracy is different, the filtration accuracy of the ultrafiltration machine is microns, and the filtration accuracy of the reverse osmosis water purifier can reach microns, because the filtration accuracy is high, so the booster pump needs to increase the water pressure to complete, that is, electricity must be used, the ultrafiltration water purifier because of the low filtration accuracy, so it can be directly filtered by tap water pressure, the ultrafiltration water purifier usually does not shoot waste water when it is used, if your water purifier is newly installed, You can see if there is a valve on the waste pipe, if there is a closure, if not, it is a lack of accessories, you can directly find the seller to deal with you, if it is an old leakage, the general situation is not the valve is not closed, or the valve is broken, you check it to know, in addition, whether there is no valve or the valve is damaged, you can temporarily fold the waste pipe in half and tie it tightly, as an emergency use, otherwise it will cause a lot of waste if the water leakage has been leaking.