How to install a Reverse Osmosis System

undersinkwaterfilterA reverse osmosis is often installed as an under sink water filter. It is really a convenient way to purify water and get a good smell and tasting drinking water at home. Such a RO system is easy to install at home. It only needs a little preparation and planning. The whole process is fairly straightforward. In the following, we’ll discuss how to install a reverse osmosis system, from preparation to pressure testing.

When you plan to buy a RO filter, the first thing you need to know whether there is enough space under the sink to install such a system. You can take a look at the under sink space and take some measurement which can help when you are looking for a system.

You also need to know what cold water source will be used. Generally, most models come with a tee connection which comes off of the 1/2” supply line going to the faucet. However, there may be a 3/8” flex line which comes down from the faucet. And we can use an adapter tee above the shut off valve to provide a source of water for the RO system.

Fetch out the reverse osmosis assembly and storage tank, making sure they can fit under the sink in desired locations. If there is a problem, you may need to consider replacing another smaller one. A good suggestion is that all the components should be set in place, which can help to determine whether there is an adjustment to be made to pipes or drains before installing the system.

Generally, they are designed to be installed under the sink. However, they can be installed in a remote location. For example, they can be installed in the garage next to the water softeners, and then run back to the faucet. Although remote installation doesn’t occupy the under sink space, there are more work to prepare.

Firstly, we need to install the faucet so that we can make the lines down under the kitchen sink, or it will get too crowded under the sink. The RO faucet housing can be mounted to the sink in the kitchen by using the provided hardware. Make the water line fed down and connect the air gap (red tube) into the faucet. This should be done before locking the faucet down onto the housing.

Install the tank connector before placing the storage tank into the right position. Teflon tape should be applied onto the threads of the tank nipple. And then screw the connector tight enough onto the tank to avoid cross threading. Don’t use other tools to screw the connector, because it only needs to be hand tight and should easily thread on.

Now, it’s time to place the storage tank in place. There is yellow tubing which is used to hook up to the tank and we will do this later.

In order to install the hanger washers on the wall, remove the filter assembly cover and then mark the locations. During this process, you can use a level to make sure the unit is balanced and straight. There are must be enough height between this assembly and the floor. The height must be at least 15 1/2”, or it will be difficult to remove filters when replacing them. Screw the hander washers onto the wall at the right location we marked and set the assembly on the washers.

Now hook up the green 1/4” water line to the water supply line. If there is a 3/8” flex line, the 1/2” adapter cannot be used. We need to shut off the water and install a 3/8×3/8×1/4 adapter tee and hook the faucet back up and a 1/4” line is for the green feed tube. And then hook up the green line with a ferrule, nut and insert.

Remember: make sure the water supply is turned off before connecting the reverse osmosis system to it.

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