After the water purifier is installed in the new house for the first time, or after the water purifier is replaced with a new filter element, the discharged water will be mixed with black activated carbon, and some will release some white colloidal substances, which is normal, because the newly installed activated carbon filter element will have too fine particles and a little stuck on the edge of the filter element, and some filter elements will also be coated with protective liquid to prevent pollution during transportation or storage, which is harmless to human health, It can be eliminated by opening the faucet and putting more water. It can also be eliminated by putting one or two more buckets of water in the water storage tank. It can be used safely in the future.