The plumbing is pretty easy depending on how you want to set the unit up. For setup under the sink, you have to tap into the cold water line running to the faucet. This is easily done as the RO
should have all the necessary parts to do so. You will also have to tap into the "trap" on the drain line of the sink so that the water that is discharged from the RO
unit can be removed. Remember, RO
units are wasteful. For every 1 gallon of RO
water produced, 4-5 gallons are wasted. This is why you must have a place to drain the discharge water to. Again, this is typically done on the drain line under the sink you are installing the unit under.
This is how mine is set up. I stick a 5 gallon bucket underneath the output of the RO
unit and then let it rip. When the bucket is full, I transfer the water in a 45 gallon trash can to store the water.
My way is definitely the most labor intensive way to do it. A lot of people install the RO
kit right next to their sump. Then they install a float switch that will trigger the RO
unit to produce water when the water level in the sump drops to low. I would do this if I had a a water line anywhere near my tank. Unfortunately it is over 100 feet way...