Connect feed water diverter valve (3-Way Switch) to the faucet You may or may not need fitting adapter depending on the type of your faucet and existing attachment Make 1/4" pipe fixed and then put the 1/4" pipe fixed in sink or insert it the drain pipe
Open the faucet (Cold water only-hot water will cause damage to the system and will void warranty) and check if there is any leak Turn on the diverter valve and run water through for 30 minutes (Attention!! The water has been purified in first 30 minutes contain active carbon. So the water can not be used or drunk.)
This diverter valve can be left connected to the faucet at all time When you need to use the tap water, turn the valve to "off" position. When you need filtered water, turn the valve to "on" position Depending on the system, purified water will exit a small side port on the diverter valve
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