You Can Install A Reverse Osmosis Under Any Sink

You Can Install A Reverse Osmosis Under Any Sink 

Do you want to install reverse osmosis under any sink? It's possible to do it by yourself if there is no additional complication. In this article, we will tell you how you can install the RO system under your sink. What materials will you need to install reverse osmosis under your sink? There are some tools and materials you will need during the installation process. For example-

  • Tape measure
  • Level
  • Screwdriver
  • Adjustable Wrench
  • Hacksaw
  • Channel-lock pliers
  • RO kit for under-sink installation
  • Plumber's pipe-seal tape
  • Adapter tee (if needed)

How can you install a reverse osmosis filtration system under your sink?

Here are the steps you should follow while installing the RO filtration system under your sink-

  • Plan the Installation: Take measurements of the available space under the sink and see if it's possible to fit a whole RO unit there. 
  • Prepare the RO system: Unbox all the RO equipment and check if everything fits within the space or not. By test fitting, you will know if adjustments on the drain/water supply pipes are required. If yes, you will need a plumber's assistance. 
  • Install the Sink Spigot: With the hardware provided, mount the RO spigot to the kitchen sink deck of the countertop. Many sinks already have a knock-out opening for the spigot, and sometimes you can use the knockout intended for a sink sprayer.   

Next up, put the waterline down through the opening and connect the air gap into the faucet. Then lock the spigot onto the housing. 


  • Position the tank: Install the tank connector by sealing the threads of the tank nipple using pipe seal tape. After that, fix the spigot connector to the tank. Make sure it's hand right and threads on easily. Now put the RO tank into position under the sink, preferably directly below the sink-top spigot.
  • Mount the Filter Assembly: First, mark the locations for the hanger washers in the wall below the sink. Screw the hanger washers on the wall as marked, then set the assembly on the washers. Make sure the assembly is at least 15.5 inches from the floor.
  • Attach the Water Line: Turn off the water supply, then connect the green 1/4-inch water line from the filter assembly to the

line. Connect the supply tube to the adapter tee using a nut, ferrule, and insert.

  • Connect the other tubing: As the tubing configurations can vary, always consult the manufacturer on the proper tubing connections. When connecting it, run the extra length of the tubing to the back of the cabinets or wherever necessary to ensure the cleanest installation.
  • Connect the drain: Position the filter's tee against the existing drainpipe, the mark, and cut the pipe with a hacksaw to fit the tee tightly. Use the slip washers and nuts to connect the drain tee fitting into the drain pipe. Finally, push the filter's black drain tube into the adapter tee.
  • Perform a pressure test: Now turn on the water supply and open the cold water on the sink to get the extra air out of the pipes. Wait for about 2 hours for the pressure to build up. Leave the spigot on for a full 24 hours and test for leaks during this time.

And now you're done! If you're facing trouble during any step, it's best to either do some more reading or just call a plumber to fix it for you. For further questions or to order a new reverse osmosis system contact us today!

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