Install Reverse Osmosis Water Filter

How to Install Reverse Osmosis Water Filter

We will guide you step-by-step so that will be no surprises if you decide to install an under sink reverse osmosis drinking water filtration system. Learn how to install reverse osmosis water filter to save a lot of money.

The reverse osmosis system is an ideal solution if you want filtered water.

Purify your kitchen water by installing a reverse osmosis system under the sink. The process takes less than an hour.

Install Reverse Osmosis Water FIlter

Check these items off your list before you start:

  • Reverse Osmosis System
  • RO storage Tank
  • Faucet and Installation Kit

The following tools are required to install reverse osmosis water filter:

  • Wrenches Sizes 7/16”, 9/16”, ½” & 5/8”
  • Phillips Screw Driver– Drill With 3/8” Chuck
  • Drill Bits Sizes ¼” or 1 1/8” For Air Gap faucet

DIY Reverse Osmosis Install Instructions

Before starting the RO installation process, read all instructions and parts and familiarize yourself with them.

Mount water supply feed

Step 1. Installation Location

Make sure that there is adequate space under the sink for the RO system before you begin. Find the cold water shutoff valve and drain pipe for the sink.

Step 2. Close the Cold Water Valve

You will need to turn off the “cold” water supply under the sink or at the installation location. The water supply to the house must be turned off if the “cold” water valve is inoperative. The cold water faucet should be turned on once the water has been turned off to relieve line pressure. 

Step 3. Connect To Cold Water Line

Connect the drain line adapter

The cold-water source can be connected to the reverse osmosis unit in several ways. These are: 

A. Saddle valve (Standard): Set up the saddle valve clamps on the “cold” water line. Set the pipe clamp adjustment plate so it fits the contour of the pipe. Pipe with a radius of 3/8″ has a small radius, while pipes with a radius of 7/16″ through 5/8″ have a large radius. Be sure to tighten the bolt so that the saddle valve is firmly attached to the feed water pipe (but not too tight).

B. Ez adapter: Teflon tape can be used to prevent leaks (optional). Assemble the feed adapters with the 90 degree needle valve.

Install the feed adapter at the sink and disconnect the flex line. Join the adapter back to the flex line.

If you are installing a “Solid line”, disconnect the line at the sink and cut it approximately 34″ long. Attach the feed adapter to the line and connect it to the sink. 

Mount the storage tank and sanitize

Step 4. Please replace corroded drain line pipes if they are damaged

One wall of the pipe should be drilled through a 5/16″ diameter hole approximately six inches above the trap. Make sure that the hole in the clamp aligns with the hole in the pipe when attaching the drain clamp. The holes should be aligned with a punch or drill bit as you tighten the clamp. Take care not to overtighten the clamp.

Related: How to Install Under Sink Water Filter

Step 5. Install Faucet

The faucet should be positioned with consideration for aesthetics, functionality, and convenience. It is essential that the faucet base has an ample flat area so that the base nut can be properly tightened. There are circumstances in which drilling a hole in the sink is not needed.

  • 5a. The faucet can be mounted simply by removing the chrome plate cover covering the hole already in the sink.
  • 5b. If there is a spray hose that doesn’t work. Simply remove it and plug the outlet beneath the main faucet. Removing the sprayer diverter at the base of the spout might make the water shut off at the main faucet if the diverter pops up.
  • 5c. It is possible to install the faucet in the counter top near the edge of the sink if there is not enough space on the upper sink area. Keep an eye out for obstructions under the counter, including drawers, cabinet walls, support braces, etc. Ceramic tile counter tops are drilled the same way as porcelain sinks.
  • 5d. It takes some caution and preparation to drill even though it is not a complicated process. When drilling the faucet hole for porcelain enameled sinks, care must be taken to avoid chipping. Porcelain sinks can be drilled with several different methods that won’t crack or chip; we have tried these two methods and discovered they work well.
    • D.1 Remove the porcelain where the ¼” diameter hole needs to be drilled using a carbide grinding wheel. Drill a hole ¼” in diameter in the metal. It produces a very smooth, clean hole.
    • D.2 Drill a ¼” diameter hole in the porcelain and metal sinks with a heavy duty variable speed drill and carbide tip drill bit.
    • 5e. Drill a hole of ¼” diameter in stainless steel sinks. Make sure the hole’s edge is smooth and free of burrs by lightly filing it. CautionIt’s important not to leave metal chips on your sink’s porcelain surface for too long, as they will stain the surface and are very difficult to remove.

Sink holes need to be drilled before the faucet stem can be inserted into the hole. Ensure that the faucet base, faucet body, and rubber faucet washer are installed above the sink.

Attach the star washer and nut to the stem of the faucet under the sink and tighten firmly while aligning the faucet with respect to the sink. The ¼” tubing should be attached to the bottom of the faucet stem once the faucet is installed. Tighten it.

It is important to note that some states require air gap faucets. Consult your local plumbing code to ensure compliance. The drain connection should be located away from the garbage disposal to prevent system fouling and contamination.

Related: 9 Best Reverse Osmosis Under Sink Water Filters

Recharge a Reverse Osmosis Holding Tank

Check the tank’s empty pressure

You may have a leaky or undercharged holding tank if you find that your reverse osmosis filtration system is not delivering as much water as it did when it was new and that your filters and membrane have been changed. Over time, the stem of the tank can lose air because it is fashioned after traditional tire valves. When the bladder cannot push as much water out when the air pressure drops.

Check the pressure by following these steps. A low-pressure gauge is necessary first. Normal tire gauges will not work. Shut off the valve at the top of the holding tank and the water supply valve to the filter system. Cut off the water supply to the tank. Remove all the water from the tank. Test the air pressure. Set the pressure as recommended. Once the tank and tubing are back in place, turn on the water and reinstall the tank.

Note the filled pressure after the tank is filled. Check the pressure again after a few days. Check the pressure again after a few days. A valve core (available at auto parts stores) can be replaced if the tank has lost pressure. If the problem persists, the tank may need to be replaced.

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