Pur Faucet Filter Vertical vs Horizontal: Which Is Better?

Every day, millions of homes rely on tap water for drinking, cooking, and washing. But many people worry about what’s really in their water. From chlorine taste to invisible contaminants, tap water isn’t always as pure as you hope. That’s why faucet filters are so popular, especially trusted brands like PUR. If you’re thinking about getting a PUR faucet filter, you’ll quickly see there are two main styles: vertical and horizontal. At first, the difference seems simple, but which is actually better for your kitchen, your water needs, and your space?

Let’s clear up the confusion. This guide compares the PUR faucet filter vertical vs horizontal models in detail. We’ll look at how they work, their strengths, weaknesses, installation, maintenance, and even the small things most people overlook. By the end, you’ll have the facts to pick the best filter for your sink—no guesswork, no regret.

Why Pur Faucet Filters Are So Popular

People trust PUR because the company focuses on advanced filtration and easy-to-use products. Unlike under-sink or pitcher filters, faucet filters clean water straight from your tap. This means:

• No waiting for water to drip through a pitcher.
• No plumbing changes needed.
• Filtered water for drinking, cooking, or even rinsing produce.

PUR’s filters use a multi-stage process with activated carbon and ion exchange materials. This removes or reduces over 70 contaminants—including lead, chlorine, mercury, and some pesticides. Some models are even certified to reduce industrial pollutants and pharmaceuticals. For families worried about water quality, this is a big deal.

But choosing between vertical and horizontal PUR faucet filters is not just about looks. It’s about performance, fit, and long-term satisfaction.

What Is A Vertical Pur Faucet Filter?

A vertical PUR faucet filter attaches directly to the end of your faucet, with the filter cartridge hanging below in a vertical position. When you turn on the tap, water flows down into the filter, then out through a separate spout.

Key Features

• Vertical orientation (filter sits below the faucet)
• Compact size, often smaller than horizontal models
• Simple flip switch to choose filtered or unfiltered water
• Easy-to-see filter indicator (on most models)
• Usually fits most standard faucets

How Vertical Models Work

Water enters the unit, passes straight down through the filter media, and exits at the bottom or side. Gravity helps the flow, so these filters rarely clog or slow down unless the cartridge is very old.

When Are Vertical Filters A Good Choice?

• Low-hanging faucets: If your faucet is close to the sink, a vertical filter may still fit because it adds length, not width.
• Small sinks: Their compact design doesn’t take up much space.
• Single users or couples: Lower flow rate is less of an issue if you don’t use large volumes of filtered water.

Example: Pur Fm-3700 Advanced Faucet Water Filter

This popular vertical model is known for reliable performance and easy installation. It’s a favorite for renters, students, and anyone who wants clean water without changing plumbing.

What Is A Horizontal Pur Faucet Filter?

A horizontal PUR faucet filter attaches to your faucet, but the cartridge sits to the side, parallel to the sink. The filter extends out horizontally, making the whole unit look wider but not much longer.

Key Features

• Horizontal orientation (filter extends to the side)
• Larger filter housing, often with higher flow rate
• Easy switch between filtered and unfiltered water
• Filter life indicator included on most versions
• Tends to have a sleeker appearance

How Horizontal Models Work

Water enters the filter chamber, travels sideways through the filter media, and exits through a separate spout. The design allows for a larger filter, which can mean longer life and better flow.

When Are Horizontal Filters A Good Choice?

• Deep sinks or tall faucets: The side extension won’t get in the way.
• Families or frequent users: Faster flow rate makes it easier to fill pots or bottles.
• Modern kitchens: The design often matches stainless steel or modern fixtures.

Example: Pur Fm-4000b Faucet Mount Water Filtration System

This horizontal model is a bestseller for its combination of style, power, and convenience. Many people choose it for busy kitchens or homes with kids.

Key Differences: Pur Vertical Vs Horizontal Faucet Filters

Let’s break down the main differences side by side.

Feature	Vertical Filter	Horizontal Filter
Orientation	Below faucet	Side extension
Size	Compact	Wider, larger
Flow Rate	Usually lower	Usually higher
Filter Life	100 gallons (typical)	100-120 gallons (typical)
Filter Replacement	Simple, quick	Simple, quick
Fit Issues	May hit sink in shallow setups	May bump backsplash or wall
Style	Basic, functional	Modern, sleek
Price Range	Usually lower	Usually higher

Credit: waterfilterguru.com

Performance: Which Filters Water Better?

Both types use PUR’s Maxion technology, so they remove the same contaminants. This means:

• Both are NSF certified for removing lead, chlorine, and other chemicals.
• Both use the same filter cartridges (with some model-specific exceptions).
• Both improve taste and odor.

However, horizontal models sometimes have a slightly larger filter chamber, which can improve flow and extend filter life by 10-20%. If you use a lot of filtered water every day, this difference adds up.

Flow Rate Test

Real-world tests show the flow rate for vertical models averages about 0.5 gallons per minute, while horizontal models reach up to 0.7 gallons per minute. That means filling a large pot takes less time with the horizontal style.

Filter Lifespan

Most vertical and horizontal PUR filters are rated for 100 gallons of water or about 2-3 months of typical use. Some horizontal models support 120 gallons before needing a new cartridge. This is not a huge difference, but for large families, it can mean one less filter change per year.

Non-obvious insight: The filter life is based on water volume, not time. If you only use the filter for drinking water, you might go six months or more before needing a replacement.

Installation: Which Is Easier?

Both types are designed for DIY installation—no tools for most standard faucets. But the shape and orientation matter.

Vertical Filter Installation

• Attach adapter to faucet.
• Twist vertical filter unit onto adapter.
• Insert filter cartridge.
• Run water to flush the filter.

This process usually takes less than five minutes. If your faucet is very close to the sink basin, make sure there’s at least 3–4 inches of clearance below the faucet for the filter to hang.

Horizontal Filter Installation

• Attach adapter to faucet.
• Slide horizontal filter unit onto adapter.
• Insert filter cartridge.
• Rotate the unit so the filter does not hit the wall or window ledge.
• Run water to flush.

Installation is just as easy, but you need extra space to the side of your faucet. Measure to be sure the filter won’t bump a backsplash or block your soap dispenser.

Practical tip: Some pull-out or sprayer faucets are not compatible with either filter type. Always check the PUR compatibility list before buying.

Space And Fit: Which Works In Your Kitchen?

The biggest mistake people make: choosing a filter based on style, not space.

When To Choose Vertical

• Sink is shallow but you have space below the faucet.
• Faucet head is not too close to the sink wall.
• You don’t have a window sill or high backsplash directly behind the faucet.

When To Choose Horizontal

• Plenty of space beside the faucet (at least 4 inches).
• Sink is deep, so the filter won’t block access.
• You have wall space, not a tight corner.

Non-obvious insight: If you have a double sink, a horizontal filter can sometimes block the divider, making it harder to move pots or pans. Vertical filters rarely have this problem.

Maintenance And Filter Replacement

Both vertical and horizontal filters use twist-off cartridges. Replacement is simple:

• Turn off water.
• Open filter housing.
• Remove old cartridge.
• Insert new cartridge.
• Run water for 5 minutes to flush.

The filter life indicator (a small LED or mechanical dial) helps you know when to change the cartridge. For both types, a new filter costs about $15–$20.

Cleaning

It’s easy to forget, but the filter housing should be wiped down every couple of weeks. Mineral deposits can build up, especially in hard water areas. If you notice white crust or slow flow, soak the housing in vinegar, rinse, and reinstall.

Credit: www.pur.com

Design And Aesthetics

Many people prefer the look of the horizontal PUR filter because it appears more modern and can blend with stainless steel or chrome fixtures. The vertical version is more basic and functional.

• Vertical: Sticks down, less visible from the side. May look “tacked on.”
• Horizontal: Sits to the side, can look integrated with faucet design.

If style matters, check the color options. Both types come in white, chrome, or black finishes to match most kitchens.

Price Comparison

You might think the horizontal model costs more because it’s bigger, but both types are competitively priced.

Model	Average Price (USD)	Replacement Filter Price (USD)
PUR Vertical (FM-3700)	$25–$30	$15–$20
PUR Horizontal (FM-4000B)	$30–$40	$15–$20

Sales and bundles are common, so check online before buying. The real cost over time is in the replacement filters, not the initial unit.

Durability And Common Issues

Both types are made from BPA-free plastic. With normal use, they last several years. The weak points are:

• Filter housing threads: Can strip if overtightened.
• Switch lever: May loosen with heavy use.
• O-rings: Rarely, a poor seal can cause leaks.

If you notice a leak, check that the filter and adapters are seated correctly and the rubber washers are not damaged.

Real User Example

Many people report that with proper care, their PUR faucet filter lasts 2–4 years. The main reason for failure is rough handling or forcing the unit during installation.

Water Pressure Considerations

Faucet filters always reduce water pressure a little. Horizontal models tend to maintain higher flow because their filter chamber is bigger.

• If your home has low water pressure, a horizontal model is less likely to slow the flow too much.
• In high-pressure homes, both work well.

Pro tip: If your filter clogs quickly, you may have sediment or rust in your water lines. Consider a pre-filter or flush your pipes before installing the PUR filter.

Credit: www.nytimes.com

Compatibility With Faucets

Not every faucet fits every filter.

• Works with: Standard faucets with removable aerators (threaded ends)
• Does not work with: Pull-out, hand-held, spray-style, or sensor faucets

Some people try to force installation on non-compatible faucets. This almost always ends in leaks or broken adapters. Check the PUR website for a full compatibility list before buying.

Environmental Impact

Both vertical and horizontal filters help reduce plastic waste because you use fewer bottled waters. One cartridge replaces about 750 plastic bottles. The used filter cartridges can be recycled through special programs, but you must mail them in.

For eco-conscious buyers, this is a big reason to choose a faucet filter over bottled water or pitcher filters (which have smaller capacity and more plastic waste).

Taste And Odor Improvement

Users consistently report that PUR filters make tap water taste cleaner and fresher. Chlorine smell disappears, and even coffee and tea taste better. Both vertical and horizontal filters use the same technology, so taste results are identical.

One point: If your water has a strong sulfur or “rotten egg” smell, even PUR filters may not remove it. This is a sign of a different contaminant, and you may need a whole-house filter.

Value For Money

When you compare the cost of the filter, the cost of replacement cartridges, and the volume of water filtered, both vertical and horizontal PUR faucet filters are affordable solutions. For most families, the savings compared to buying bottled water are significant.

• Vertical filter: Slightly lower cost upfront, great for singles or couples.
• Horizontal filter: A bit more expensive, better for families or heavy users.

Which Is Right For You? Making The Decision

Choosing between the PUR vertical and PUR horizontal faucet filter comes down to three main factors:

• Space: Measure your sink and faucet area. Vertical is best if you have room below; horizontal if you have space to the side.
• Usage: Families or heavy water users will appreciate the higher flow and longer filter life of horizontal models.
• Style: If you want something that blends in, horizontal models usually look more “built-in.”

Common mistake: Some people buy the wrong style and have to return it because it doesn’t fit their sink. Always check dimensions and compatibility before buying.

If you want more technical details or NSF certification info, you can find reliable resources at NSF International.

Frequently Asked Questions

What Contaminants Do Pur Faucet Filters Remove?

PUR faucet filters remove over 70 contaminants, including lead, chlorine, mercury, some pesticides, and industrial pollutants. They also reduce bad taste and odor. Both vertical and horizontal models use the same filter technology and have similar certifications.

How Often Do I Need To Change The Filter Cartridge?

For both vertical and horizontal models, you should replace the filter every 100 to 120 gallons, or about 2–3 months for typical use. If your water usage is low, you might go up to 6 months before needing a new filter.

Can I Install A Pur Faucet Filter On Any Faucet?

No. PUR faucet filters fit most standard faucets with threaded ends, but do not fit pull-out, hand-held, spray-style, or sensor faucets. Always check your faucet type and the PUR compatibility list before buying.

Is The Water Flow Slower With A Pur Faucet Filter?

Yes, there is some reduction in water flow. Horizontal models generally have a higher flow rate (up to 0.7 gallons per minute) compared to vertical models (about 0.5 gallons per minute). For most kitchen tasks, the difference is not a problem.

Are Replacement Filters For Vertical And Horizontal Models The Same?

Most vertical and horizontal PUR faucet filters use the same replacement cartridges. Always check your model number to be sure, as a few older models may need a specific cartridge.

Choosing between a PUR faucet filter vertical vs horizontal model doesn’t have to be confusing. With the right information about your kitchen space, usage needs, and personal style, you can confidently pick the filter that will give you clean, great-tasting water for years to come.