Ultraviolet UV Light Water Sterilizer Can be used individually or Connected to Other Water Filtration Systems· This is an inline filter system that can be used individually to sanitize your drinking water. · The package includes all the parts you need to sanitize your water. · It can also be used as an add-on filter kit to upgrade yours, like under sinks with 3 or 4 stage water filter systems, or any sinks Reverse Osmosis Systems. · Easy to install.UV light in this system stays on at all times for two reasons: 1. UV light bulb is like a fluorescent light, frequent shut-off will greatly reduce its life span.2. The UV light bulb takes a second to warn up from the cold temperature to reach its full sanitizing power.Package Includes: Stainless Steel UV Light chamber with 1/4″ OD quick connectors Quartz Sleeve and silicon sealer UV Lamp (12W~16W) Sanitizing water up to 1.0 gpm water flow 110V Power Adapter Note: UV light will consistently sterilize your water. But the input water quality may vary over the time. If this system is the only treatment for your drinking water, please test the output water regularly by professional water quality tests to make sure it is safe for drinking. Since there may be many kinds of risks in the untreated water supply, this system alone cannot guarantee the safeness of the water it produces if its input water is not from a tested drinkable water resource.