How to Choose the Best Water Filter for Your Home

You've already decided that you want to have some kind of water filter for your home. Am I right?

I figured that's why you're here.

But maybe you're not sure what kind you want or need. I know it can be a little overwhelming.

So I've put together this guide to help you understand what the different options are and how to decide which one is best for you.

More...

You'll find explanations of all the common types of water filter systems available for home use and things you should consider in making your decision. I hope you'll find it helpful.

3 Steps​ to Determine Which Water Filter is Best

There are three basic steps to making the right decision about your water filter.

1

DETERMINE YOUR WATER QUALITY

What do you want to filter out? Are there specific contaminants like lead or fluoride that you're concerned about? Or is it just that your water tastes or smells funny?

If you're not sure, there are a couple of things you can do.

One is to read your local water quality report if you are on a public water supply. You can look for your system at the EPA Consumer Confidence Reports (CCR) page.

If you're on a private well or if you're not 100% confident in the government report, you can have your water tested. 

Click here to find a state certified laboratory where you live.

You can also find home testing kits online. They may not be as thorough as the state testing labs, but they're a good place to start. You'll want to be sure that whatever test you use checks for lead.

2

DETERMINE THE CAPACITY YOU NEED

How many people live in your home? How many gallons of filtered water will you need each day?

Do you only want to filter water for drinking? Or will you use it for cooking, too? What about bathing and showering? 

3

MAKE THE DECISION

Take a close look at the features of the different types and brands of filters. Then decide which one will meet your needs in terms of contaminant reduction and capacity.

​Points to Consider

You'll want to keep these three things in mind while you're evaluating the different types of filters:

A

EFFECTIVENESS

​One type of filter might be effective for removing certain contaminants, but not others. Among different filters there can be a difference in the percentage of reduction, too.

And then there are some filters that remove virtually every contaminant.

So be sure to pay attention to the degree of effectiveness for the contaminants that you're most concerned about.

B

EASE OF USE

Some water filters are connected to your plumbing. All you have to do is turn on the tap to get clean filtered water. This would include whole house filters and undercounter carbon block or reverse osmosis systems.

They're simple to use, but there's the installation to think about. You'll either have to install it yourself or hire a plumber to put it in.​

Others take a little more effort on your part because you have to fill them manually with tap water. Pitcher filters, distillers, and gravity filters are examples of this type.

​Of course, it's not hard to fill those by hand, but you have to stay on top of it or you'll run out of filtered water. Then you'll have to wait a little while to make more.

The advantage is that they're portable and you don't have to mess with the plumbing.

​So think about whether you're willing to refill a filter system one or more times a day, or whether you'd rather have an installed system.

C

COST

You can spend anywhere between $20 or so for a pitcher filter to thousands for a fancy installed multistage system.​

That's just the initial cost. Then there's the cost of any ongoing maintenance like filter replacement.

Think about whether you can afford to maintain the system you choose.​

POE versus POU

In the broadest sense, there are basically two categories of water filters:

Whole House/Point of Entry (POE)

In other words, with POE, the water encounters a filtration system first thing when it enters your house. This is going to filter all of your water - all sinks, washing machine, bathtub, exterior spigots, etc.

I don't cover whole house filters in this blog.

Point of Use (POU)

With POU, the filtration happens where the water is actually being used. Some types are connected to the plumbing at a single location, like under a kitchen sink. A reverse osmosis system is one example.

Others are countertop units that need to be filled by hand. Pitcher filters, faucet-mounted filters, gravity filters, and distillers are types of POU filters.

Water Filter Technologies

There are quite a few water filtration technologies to choose from. 

Each material and method has its own strengths and weaknesses and level of effectiveness. That's why it's important to know exactly what you're getting when you buy a water filter.

So, here's a list of the most common methods and a description of each. Some of them might be used as standalone filters, and some are combined with other technologies as part of a system.

Activated Carbon

Activated carbon can come from any kind of organic material that has a high carbon content. You'll often see carbon filters made from coconut shells, for example.

It's a porous material with a slight positive charge that attracts impurities and makes them adhere to the surface. This is called adsorption.​

Not all carbon filters are equally effective, though. Some of them only get rid of chlorine and bad smells and taste. But others can remove a lot of different organic compounds like VOCs​ and radon.

Carbon does not work for inorganic compounds like fluoride, arsenic, heavy metals, and chromium-6.

There are two common types of carbon filters: carbon block and granular activated carbon (GAC).

Carbon block filters have a greater surface area, so they're generally more effective than GAC filters.

Because carbon filters collect contaminants, they eventually reach a saturation point and have to be replaced.​

Ceramic

Ceramic filters have tiny holes that allow water through while blocking particles of dirt and certain contaminants. While they're effective for filtering out bacteria and protozoa, they're not able to block viruses or chemicals.

Sometimes ceramic filters are embedded with silver, which is a natural bactericide. That's to prevent bacteria and algae from growing on them.

As long as they don't get broken, ceramic filters can be used for years, so they're an economical choice.​

Distillation

Distillation works by boiling water and collecting the steam. As the water evaporates, the contaminants are left behind. When the vapor cools, it returns to liquid form. 

Biological contaminants like bacteria and viruses are killed by the boiling.

There are a few VOCs that have a lower boiling point than water, so they're not removed by distillation. Most home distillers have a carbon filter to take care of those contaminants. The result is pure H2O with nothing else in it.

Reverse Osmosis

In reverse osmosis (RO), water is forced through a semipermeable membrane. This membrane will block any particles that are bigger than the water molecules.

An RO membrane will block bacteria, viruses, protozoa, and many chemical contaminants like arsenic, fluoride, lead, and nitrate. But it won't work on chlorine, VOCs, or trihalomethanes.

That's why reverse osmosis systems always combine an RO membrane with one or more carbon filters. Together, they make a complete purification system.

UV

Ultraviolet (UV) light is used to disinfect water by killing bacteria, viruses and protozoa.

Well, it doesn't actually kill them. What it does is attack their DNA so they can't reproduce. Almost the same thing.

UV purification is usually paired with reverse osmosis or some other form of filtration.​

Most Common Types of Water Filter Systems

In this section, I'm going to tell you about the different ways that filter systems can be set up. You might find one filtration technology used in several types of systems. 

Faucet Mount Water Filter

Faucet-mounted filters are attached to the end of the faucet. You just take off the aerator and screw the filter on in its place. 

There's usually some type of off/on switch so you can turn it on when you want filtered water and then turn it off for washing.

Most faucet-mounted devices use an activated carbon filter to improve the taste and smell of the water. Some models are able to remove other contaminants like lead.

Advantages

  • Simple installation
  • Inexpensive
  • Can switch between filtered and unfiltered water

Disadvantages

  • May slow down flow of water
  • Doesn't work with all faucets
  • Filters have to be changed often

Average price range: $15 - $50

Countertop Water Filter

​A countertop system connects to the faucet, but the filter unit sits on the counter next to the sink.

Some models have an attached faucet, so you dispense the water right from the filter.

Others send the water back through the sink faucet, and you toggle the filtered water on and off using a switch.

Different models use different types of filtration. The simplest ones just use activated carbon, but there are others with multiple filters. You can even get countertop reverse osmosis filters!

So, of course, the types of contaminants removed can vary greatly from model to model depending on the type of filtration technology they use.

Advantages

  • Easy to install 
  • Can switch between filtered and unfiltered water
  • Doesn't use up cabinet space under the sink
  • Longer filter life than faucet mount

Disadvantages

  • Takes up counter space
  • Sometimes doesn't attach to faucet and requires modification

Average price: $30 - $300

Water Distiller

​A water distiller looks a lot like a coffee maker. It sits on the counter, and it runs off of electricity. 

It has two containers - a boiling container and a collection bottle of some sort.

To use it, you fill the boiler with tap water, put it in place in the unit, and push the start button. The machine does all the rest.

The process is slow. It can take between 3 and 6 hours to distill one gallon of water, depending on the model.

Home water distillers always have a small carbon filter to remove any VOCs that might be left in the water after distillation. It's possible that you don't even need that extra filter, depending on the quality of your tap water.

Some people don't like the fact that even good minerals are removed during distillation. This can be remedied by adding a pinch of salt or liquid minerals to the distilled water, if you like.

Advantages

  • No installation
  • Easy to use
  • Portable

Disadvantages

  • Very slow
  • Needs electricity
  • Gives off heat

Average Price: $100 - $800

For more information about choosing a water distiller, see my article, Best Home Water Distiller Options.

Pitcher Water Filter

​Water filter pitchers are straightforward and simple. 

They have a reservoir on top that you fill with tap water. The water drips down through the filter and collects in the bottom part of the pitcher.

You can find pitcher filters in all kinds of styles and colors. Most of them hold about 2 quarts, but some are bigger than that.

There's a wide range when it comes to effectiveness, so you'll want to be sure to take a close look at the specs if you're thinking about getting one.

All of them remove chlorine and bad tastes and smells at a minimum. But a few are more advanced and can remove things like lead, fluoride, VOCs, and pesticides.​

You'll also want to pay attention to the price of the replacement filters and the filter life. Sometimes replacing the filters almost costs the same as buying a whole new pitcher.​

Or you might find that it ends up costing more than a different, more effective type of filter.

Advantages

  • Different styles and sizes available
  • Inexpensive
  • Portable
  • No installation

Disadvantages

  • Have to refill frequently
  • Most are hard to pour without spilling
  • Filter replacement can get expensive

Average Price: $25 - $75

Click here to read about the 10 Best Water Filter Pitchers.

Gravity Water Filter

​Gravity filters are countertop systems that you have to refill by hand. They're kind of like pitcher filters on a much larger scale. 

But, they're much more powerful and effective than the majority of pitcher filters.

​The system consists of two large chambers that nest together. The filters are in the top chamber, and sometimes in the lower one, too. You fill the top with water, and gravity pulls the water down through the filters into the lower chamber. 

There's a spigot in the bottom chamber for dispensing the water.​

Most gravity filters use either activated carbon or ceramic filters.​ Some manufacturers combine carbon with other materials to increase their effectiveness. 

The most popular gravity filters are made of stainless steel. They're durable and they're portable, making them ideal for emergencies and for outdoor use, as well as for everyday use at home.

You'll also find that they remove a wide range of harmful contaminants from water. And, unlike other systems, you don't have to start with tap water. You can even put water from streams and ponds into them and end up with clean safe drinking water.

Advantages

  • No installation
  • Can use any kind of water except salt water
  • Filters last a long time
  • Variety of sizes
  • Portable

Disadvantages

  • Slow
  • Have to refill
  • Takes up counter space

Average Price: $200 - $400

Get more information about gravity filters here.

Under Counter Carbon Block Water Filter

​These filters are connected to the water supply and are installed under the sink. They have their own faucet mounted next to the regular sink faucet.

​When you turn it on, water flows through the activated carbon block filter and out the faucet.

Carbon block filters mostly just remove chlorine and make the water taste and smell good.​ Some brands are more effective than others and work on a wider range of contaminants.

Advantages

  • Doesn't take up much space under the sink and none on counter
  • Long filter life
  • Affordable

Disadvantages

  • Installation required; may need a plumber
  • Limited effectiveness.
  • Filter replacement can be a hassle.

Average Cost: $50 - $500 (plus possible installation fee)

Under Counter Multi-Stage Water Filter

Multi-stage filters are hooked up to your plumbing, and they have their own dedicated faucet​. That means you might need to hire a plumber if you're not comfortable trying to do it yourself.

​They combine several different filtration technologies. That's why they're called "multi-stage".

Most of them include a reverse osmosis membrane plus two or more activated carbon filters.

​Other options you might find are a UV filter for disinfection or a filter that adds minerals to the water. Sometimes you can buy a basic system and then add on more stages later if you want.

The contaminants that are removed vary from product to product, depending on the types and quality of filters they use.​ So you really need to look at each model's specs to see how effective it is.

I will tell you, though, that reverse osmosis systems are generally good at removing most kinds of contaminants.

Advantages

  • Constant supply of drinking and cooking water
  • Can customize
  • Doesn't take up counter space
  • Long filter life

Disadvantages

  • Installation required; may need professional plumber
  • Takes up space under sink
  • Expensive replacement filters

Average Price: $200 - $500 (plus possible installation fee)

If you'd like more information about reverse osmosis systems, please see my article Best Reverse Osmosis Systems | Reviews & Ratings.

Testing and Certification

Sometimes you'll see water filters that are "NSF certified" or "tested to NSF standards".

What does this mean, and does it matter?

First, what NSF is:

NSF International is an accredited, independent third-party certification body that tests and certifies products to verify they meet (certain) public health and safety standards. Products that meet these standards bear the NSF mark. (link)

There is no requirement that water filters be NSF tested or certified. It is not a government agency and doesn't regulate anything. NSF testing and certification are strictly voluntary.

Most ​reputable water filter manufacturers do have their products tested by independent laboratories, and they're happy to share the test results with the public. 

It's my opinion that examining independent lab test results is more important than seeing an NSF emblem on a product. NSF certification means that the product has passed the minimum standards set by NSF.

Some products far exceed that standard even though they haven't been tested by NSF itself.​

Also, it's very expensive for companies to have their products NSF certified, so they may choose not to pursue certification.

When you see that a product is "tested to NSF Standards", that means that it has been tested using the same criteria. But, you don't know if it met or exceeded the standards, or if it even fell short. The only way to know this is to check the independent lab test results.

So, while NSF certification can be useful in determining the quality of a water filtration product, it's not the ultimate proof that the product is worthy of consideration.

To learn more about NSF certification for water filters, visit the NSF website here.

Conclusion

Congratulations if you made it all the way to here! That was a lot of information to take in!

Let me give you a quick summary of how to pick the best water filter:

  • First, determine which contaminants you want to eliminate from your water.
  • Next, estimate how much filtered water you'll need every day.​
  • Then, decide which types of filters will meet your needs.
  • Last, take a look at your budget and buy the best one that you can afford.

If you still have questions, feel free to leave a comment and ask away. I'll do my best to answer as soon as possible.

Marge

I’m a healthy living blogger who loves to help people who care about having a healthy home environment make smart choices and save money.

Click Here to Leave a Comment Below
Chad - September 5, 2017 Reply

I don’t get your reasoning, why is it cheaper to NSF test a product at a 3rd party lab than the NSF certification themselves? Surely it couldn’t be more than a few hundred dollars more, and they can stick a genuine NSF logo on the product, thus earning a return on investment. The NSF is a non-profit organization afterall? (hence the .org) Something seems fishy here.

Adam Sharpley - August 25, 2017 Reply

Very informative blog Marge! It makes complete sense that we must first determine the type and quality of the water at our place and the capacity that we need. Many thanks!

Rockwell Marsh - May 16, 2017 Reply

Hello Marge, It’s very effective and good way to choose a water filter. I like your thoughts. And you have described very important point about water. Thanks!

John - April 26, 2017 Reply

I have been pretty concerned lately about the quality of water coming through my home. My wife and I started looking at getting a water filter and had heard that reverse osmosis systems could be a good option. The article mentions that a reverse osmosis system is simple to use, but may require an installation. This is good to know since I have no experience with water and will most likely look to a plumber for installation.

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