MI Water Purifier, by innovatively integrating a complex piping system into a unity, has a minimized foot print and is free from leakage risk. By using a 400 gallon RO membrane, with a precision of 0.0001 micron, it removes 99% of contaminants in tap water. Connecting the tap to the electric faucet with an adapter, users can finish the installation independently in five minutes without the need of adjusting it to existing sinks. By yielding filtered water in seconds, the storage tank is disposed to avoid secondary pollution. Parameters (filtered water purity and remaining service life of each filter cartridge) are displayed on an app, visualizing the explicit device status for the users.