under sink water filter

A Step-By-Step Guide to Installing an Under Sink Water Filter

Have you ever gone to get a glass of water from the sink, only to notice that it didn’t quite taste right? Maybe you decided to drink bottled water instead, but you feel guilty about how many plastic bottles you’re throwing away now. There has to be a happy medium between having clean water and saving the excess plastic waste.

The good news is an under sink water filter can solve all these problems. As the name suggests, these filters are installed under your sink and have a separate faucet you can use for drinking water. These filters can help remove chlorine, lead, nitrate, viruses, and more undesirable components from your water.

Better still, installing an under sink water filter is a relatively simple job. You can do it on your own with a few basic tools and a couple of hours.

Read on to learn how.

Shut Off Cold Water to the Kitchen

The first thing you’re going to want to do in installing your under sink water filter system is to turn off the cold water to your kitchen. You’re going to be working on the plumbing, and if you’ve ever had a pipe burst, you’ll know the last thing you want is water going all over your kitchen.

There should be a shutoff valve attached to the cold water pipe under your sink. Turn that all the way off and then disconnect the water line from the shutoff valve. Do this by loosening the nut there and taking the tube off the valve fitting.

After you shut off the water supply, there will still be water in the line that you’ll want to drain out before you begin work. Do this by turning on your faucet and leaving it open until all the water has drained out. That way you won’t wind up with water running out all over the place.

Mark the Location

Before you start cutting up any pipes or drilling holes in anything, you’ll be want to sure of where you’re placing your new under sink filter. You’ll need to nail down the specific place where your water filter will sit, as well as where you want the new faucet to come out. This is where the old “measure twice, cut one” adage comes in.

Place your water filter under the sink on the wall closest to the cold water line. Hold up the mounting bracket around the filter and mark where the screws will go. Then drive the screws in about halfway at the marks.

You’ll also want to decide where your new faucet is going to be located. If you have a soap dispenser or a spray nozzle you’re planning to get rid of, you may be able to use an existing hole. If not, determine where the new faucet will be, triple check the location, and mark that spot on your sink.

Drill a Hole in Your Sink

If you’re replacing a soap dispenser or a spray nozzle with your new under sink filter faucet, you can disregard this step. If you’re drilling a new hole, check one more time that the placement is exactly where you want it. This may seem like overkill, but once the hole is there, you can’t un-drill it.

For most standard under sink water filter systems, you’ll need to drill a 1 1/4 ” hole in your sink. You’ll want to take into consideration what material your sink is made of before you start drilling. If you have a ceramic or granite sink countertop, there are a few methods you may want to look into, including the knock out method and a diamond-tipped hole saw.

If you have a steel sink, you can still drill the hole yourself. You’ll need to use a carbide-tipped blade, and you’ll need to use lubricant to keep everything from overheating. Start by drilling a 1/4 ” hole and then expanding from there, running the drill at half speed to keep the temperature down.

Split Your Water Line

Because you’re going to have a new faucet in your sink, you’re going to need to have a separate water line running to your under sink filter. This means splitting your existing cold water pipe. But don’t worry, you’re already halfway done with this step.

Remember that water line tube we disconnected from the shutoff valve earlier? This is where that comes back into play. You’ll need to check if your under sink water filter system includes a splitter, and if it doesn’t, buy one.

You’ll want to attach the splitter to the water shutoff valve. If you have 1/2 ” fittings, you’ll need to get a 1/4 ” adapter for the splitter. This should be available at your local hardware store.

Hang the Filter

Now comes the exciting part of the job! It’s time to attach the water filter. The first thing you’re going to want to do is to attach your newly split water line to the filter.

Your filter should have two valves to attach water lines to. One will be labeled for tap water in, and the other will be labeled for clean water out. Make sure you attach the line coming from your water shutoff valve to the tap water in the valve.

Then you’ll need to attach the hose to the new faucet to the clean water out valve on your under sink filter if it isn’t already attached. Once that’s secure, you’ll need to drive the screws on the mounting bracket the rest of the way in. Your water filter should now be securely attached under your sink.

Attach the New Faucet to the Sink

Now that your new under sink water filter system is in place, it’s time to install the new faucet. You should have your drill placed at this point and the hose to go to the faucet attached to the filter.

You’ll want to start by inserting your new faucet into the hole in your sink from the top. Then attach the hose from your water filter to the bottom of the faucet. At this point, all the plumbing should be reconnected.

Once the faucet is connected to the filter, lift up the faucet slightly and place a bead of plumber’s putty under the faucet. This will help secure the faucet and prevent leaks. Set your faucet in place and tighten the nut under the sink to hold it in place.

Turn the Water Back On

Now that all the connections are back in place and your water filter is securely installed, it’s time to turn the water back on. You probably want to leave the faucet on for this to allow air to escape the line.

Slowly turn the shutoff valve to turn the water back on. Because your water filter faucet may not be able to be left open (much like a spray nozzle), many will come with a built-in air release valve. Be sure to locate this before you turn the water back on and use it as you turn the water back on.

Once the valve is all the way back open again, you’ll want to let your water run for several more minutes. This will make sure all air is “burped” out of the line, as well as cleaning out any dust or dirt that may have gotten in the piping during the installation process. You also want to make sure to run your water filter faucet to get your new under sink water filter system fully online.

Check Everything

While you’re letting the water run after installation is complete, triple check every connection on the system. Make sure to dry off all pipes thoroughly, let the water run for a few minutes, and make certain that nothing is leaking. A little leak may not seem like a big deal at the moment, but in the long run, it can have major consequences.

Many under sink filters come with plastic piping, which can break down more quickly than you might like. If you’re worried about the long-term integrity of the piping, you may want to look into getting some metal supply lines. Most hardware stores should have flexible stainless steel supply lines in a variety of sizes available to buy.

Once you’ve made certain everything is securely attached, and nothing is leaking, and after letting the water run for several minutes, you can shut off the faucet. Congratulations! You now have a new under sink water filter system.

Get Your Under Sink Water Filter

Installing an under sink water filter is a job you can easily do yourself with just a few basic tools and a couple of free hours. Cut dangerous chemicals out of your life, and save the earth by reducing plastic bottle waste at the same time!

If you’re looking for an under sink water filter, check out our amazing selection at DiscountFilters.com. We are your source for air and water filters. We can guarantee top quality and customer service. Contact us today to get started on your next step towards cleaner water.

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