PUR FM-3700 Advanced Faucet Water Filter

In this article, we’re going to discuss the features, the pros, and the cons of the PUR FM-3700 Faucet Water Filter, one of the most rated filters on the market. With the world becoming more and more cautious about what we eat, what we drink, how we sleep, and how do the things around us affect us, we start to focus on the things that were once harmless – one of those is water.

PUR FM-3700 Advanced Faucet Water Filter

Because there’s this idea of water being the most valuable source in nature, which it is, we don’t think about possible issues that could happen in the process of the water traveling from the source to us. Water can often get contaminated just by moving to our faucets – there is dirt, rust, various toxins left by industries. There are cysts, bacteria, and viruses that could get in your water in many ways.

If you are worried about the quality and the taste of your water, we advise you to get a water filter. It’s not just a solution regarding the aesthetics of the water, but a crucial step we need to take to protect our health better. 

First, we are going to discuss all of the features of the PUR FM-3700 Advanced Faucet Water Filter. Then, we are going to present to you the pros and cons so you can decide whether this product is something you want to invest in or not.


Trust Pur We Filter MorePUR Faucet Filters are certified to remove 99% of lead and reduce over 70 contaminants including mercury and certain pesticides.
Try It & SeeContaminants enter the water system daily, that’s why filtering your water is important.
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Advanced Filtration

Quite obviously, the first thing that you need to pay attention to when it comes to a water filter is the filtration system that is in it. This particular filter has a very reliable filtering system, and you don’t need to install anything additional under the sink or near your water source, you install the filter directly on your faucet.

The filtration will remove about 99% of lead, chlorine, and about 70 other contaminants. The filter has an activated carbon layer that is pretty eco-friendly and does a great job at filtering sediments, as well as live organisms like viruses and bacteria.

Another layer in the filtering process is called the ion exchange layer. It’s a layer that is made to balance the pH of your water while leaving the proper irons behind. This is something that we need to pay more attention to, as water still has some essential ions and minerals that we need for proper functioning. 

The Numbers

Let’s discuss the numbers that you need to know when it comes to this water filter. First of all, we want to tell you that no one can actually know how long your water filter is going to last before you need to replace it. Don’t believe anyone that sells you a story about six months or a full year, as the only significant number you need to know when it comes to the filter’s lifetime is the number of gallons the filter can filter before you need to replace it.

This filter will provide you with about 100 gallons of water before you need to replace it. If you use a gallon a day, you will use a filter for three months. However, if you use 3 gallons a day, you will be able to get a month of use out of this filter. The lifetime of this filter is not that great, as you can conclude, but many people still go for it because of the filtration quality. 

Save Money

By getting a water filter, you will also save a lot of money. One gallon is about four liters of water, which means that 100 gallons are about 400 liters of water. This equals to about 800 bottles of water, also known as $400 if we take into account the usual 50-cent price of one bottle. 

Also, as you put this attachment on your faucet, you will notice that the pressure gets slightly lower than the usual one and that you need to wait longer to pour the same amount of water. This can get a bit annoying for some people, but it’s a great way to save money and avoid water from getting wasted on the daily.

Another great thing, one that will also save you money, is the fact that the filter has an on-off handle. This means that you can turn off the filtering process if you wish to use the faucet for something that isn’t as important to you. If you’re washing the floor and you need a bucket of water, there is no reason for you to use filtered water and shorten the lifetime of your filter, right?  


The installation of PUR FM-3700 is quite easy, and there isn’t a lot of things you need to know besides the regular installation guide you can find online. Since this filter doesn’t require any tools to be installed, you can pretty much attach it to your faucet. We want to tell you a few tips and pieces of advice regarding this, though.

As most faucets are sturdy and durable, people don’t usually experience any issues. However, if your faucet is a bit flimsy or if you hadn’t adequately tightened the base of the tap, the additional weight of the filter can create issues with the plumbing. Try first to fix any possible issues that already take place, and then attach the filter to the top of the faucet.

Also, if you have a pull-out faucet or a faucet that’s usually held by a hand, you won’t be able to attach this filter. This filter is made for regular sink faucets.

When you decide to replace your filter, you only need to buy the filter cartridge that can be returned in a few easy steps. First, you remove the cap of the filter housing off, then you insert the new filter and throw the old one away, and you just put the lid back on. Don’t forget to let the water around for at least five minutes to get the best results.

Premium Taste

Another thing that is very beneficial when it comes to this filter is the unique MineralClear base that is included in the filtering process. This feature leaves the water feeling refreshing and crispy. In combination with reduced chlorine and removal of other possible chemicals, your water will taste clean, bright end satisfying. 


  • easy attachment
  • compatible with most faucets
  • very easy to install and replace
  • great filtering
  • NSF certified


  • some people noticed leaking after the first cartridge replacement
  • customer service can be slow


If you’re a beginner when it comes to water filters, and you’re not sure whether you want to install something heavy-duty, like an under-sink filter, this filter is pretty much the best choice out there. You mount it to the top of the faucet, and you can remove it anytime you want.

The quality of the filtering is pretty good, and it’s NSF certified, but people claim that there are surely better-looking filters on the market. If aesthetics are important to you and you don’t want this filter to be so visible, you should look elsewhere. Overall – easy to install, easy to use, good quality, weak aesthetics. 

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