I am sure you could connect an RO like mine to simply run off a direct connection to the faucet in the sink instead of being tapped into the supply pipe as mine is. All RO units also need a waste connection because they waste much more water than they produce. In my arrangement, I have tapped the waste line into the drain off the sink but it could as easily be a simple hose draped hanging into the sink to provide a temporary waste path. I see no reason to hold back from using an RO if you have a situation that demands one. Even if you fully install one in the kitchen of your apartment, you do nothing in the process that will harm the plumbing. It requires a tap into the cold water pipe under the sink, a tap into the drain from the sink and a simple tank positioned in any convenient location to store the RO water. To use the RO water, you need a way to drain it from the storage tank. Since most kitchen sinks already come with an extra opening in case you want to install a soap dispenser, I simply used that opening as a place to mount my RO faucet. That means I have 2 separate faucets in my sink. One provides a mix of hot and cold water and the other provides RO water. You can place the storage tank anywhere, but I chose to place mine in that corner cabinet in the kitchen where you can never really store anything anyway because it is so hard to reach. The RO itself is in the cabinet under the kitchen sink and simply hangs on the side of the cabinet there. When or if I ever leave this home for another, I will leave the RO behind as a nice selling feature. Who would not want the option of using purified water for making their tea or coffee? An RO costs not much more than 4 or 5 nice meals away from home would cost so it is not a huge investment to worry about when you move out of the place.
/www.theaquariumsolution.com/ro-garden-tap-connector
