Whole-House vs. Under- Sink Water Filter Systems – Detailed Comparison + Pros & Cons

Whole house water filter systems are point of entry water filters that are installed at a centralized point so that every single drop of water passes through the filtering system and every member of the household gets clean and chemical-free water.

Undersink water filters are point-of-use water filters that are installed into existing pipework below your sink so that all water from your faucet is filtered.

If the water in your home has a bad odor, sediment, or mild TDS, an under-sink water filter may be your solution. If you have more sinister contaminants such as heavy metals and some inorganic and organic materials, then you may need a whole house water filter.

The need for pure drinking water has taken center stage as concerns over the purity of municipal water supplies rise. Most homes also have between 8 and 15 sources of water and each source of water in your house must be filtered.

So let’s look more into what whole house water filters and under sink water filters are?

Whole House Vs Under- Sink Water Filter Systems

About Whole House Water Filter Systems

Whole house water filter systems are the perfect solution if you want a total supply of pure, healthy, and great tasting home water.

The initial expense of a whole house water filter installation can appear to be excessively expensive compared to an under-sink water filter, but in the long term, it is a very cost-efficient option.

Water filter prices are dictated by the material composite, size, and lifespan.

Besides supplying top-quality tap water for the whole house, there are additional benefits that can be gained.

Benefits Of Whole Water Filters:

  • Save money and avoid buying bottled water.
  • Enjoy safe drinking water all the time.
  •  Reduce potential plumbing issues.
  • Prevent skin irritation from the chemicals that the water may carry with them.
  • Save soap and enjoy cleaner clothes.
  • Reduces limescale and other minerals deposited.

A whole house water filter is a great investment to the home and does not require upkeep or monitoring.It need not  necessarily be the most expensive also.

What you want is a whole-house filtering system that is of high quality. To determine the quality of the water filter ensures that it is first certified by the NSF.

About Undersink Water Filter Systems

Any under-sink water filter is designed to treat tap water before it reaches the kitchen sink. This type of filtration will make sure that sediments, physical and chemical factors are removed from the water, thus making it purer and healthier.

Installation is often easy – if you are not generally afraid to change a light bulb, then you should have no problem installing an under-sink water filter.

Most under-sink water filters are screwed onto the valve that exists below your sink, therefore, when water is turned on, it will first go through the filter, and then reach your sink. The process is rather simple and logical.

Of course, not all under sink water filters do the same thing – the cheaper ones will only clean your water of sediments and similar physical particles.

Others may clean your water from any biological (bacteria and viruses) particles, and the top-notch ones will ensure that all harmful chemical compounds are removed too.

You can easily notice the difference by looking at the price tag or the specification of the box.

Benefits Of Undersink Water Filter Systems

  • They improve the water taste.
  • They make water safe for drinking.
  • Makes water healthier for drinking.
  • Cost-efficient.

So, what should you be looking for as far as the performance from your under-sink water filters? You should first ensure that you are looking for a product that is NSF certified.

An under-sink water filter system should effectively eliminate most of the available categories of contaminants that are currently found in our drinking water supply, and not just chlorine.

High-quality under-sink water filters should be equipped to remove all manner of chemicals and germs by utilizing several different filtering stages all in a single unit.

The layering of these stages is what guarantees sufficient filtration that you and your family need.

Most under-sink water filter systems have four different filtration stages which include an activated granular carbon filter, a multi-media block, an ion exchange filter, and a sub-micron filter.

These four stages will effectively remove everything that you have in your water.

Let’s now dive in and see what are the best whole houses and under-sink water filters in the market.

Best Whole House And Under Sink Water Filter Systems

Culligan (WH-HD200-C) Whole House Heavy Duty Water Filtration System

The Culligan WH-HD200-C System is the perfect pick for residential homes in protecting appliances and plumbing from sediments.

The Culligan has a compatibility filtration system that includes Culligan filter cartridges: R50-BBSA, CW25-BBS, CP5-BBS,


The Culligan WH-HD200-C preventive benefits include significant reduction of iron, no scaling in water pipes, showerheads and kitchen sink faucets, dishwashers, and washing machines become sparkling clean.

Culligan provides the family with visibly clean, great-tasting water for drinking, cooking, and more. It reduces sediments’ rust, scale, dirt, coarse and sand.

It’s a hefty heavy-duty whole water filtration system with a pressure rate of 125 psi. The integrated bracket design guarantees easy installation.

The filter has been certified by WQA against NSF/ANSI standard 42 for materials safety and structural integrity only.


  • Clean, pure drinking water.
  • Less expensive.
  • Reduces the hustle of having to buy bottled water.
  • More flavorful drinking’s.
  • Reduces sediments like rust, scale, dirt, coarse sand, fine sand, and sand.


  • Poor packaging- missing parts.

iSpring 2-Stage ( WGB21B) Quality Whole House Water Filtration System with 10″ x 4.5″ Big Blue Sediment CTO

The iSpring WGB21B 2-Stage Whole House Water Filtration System uses a unique two-tank design. One tank uses an efficient filtration media that adopts 5-micron polypropylene filtration media.

This media can effectively reduce chlorine taste and odor and contaminants including the large particles and the sediments.

The second filter uses the CTO filter(FC15B) to remove cloudiness as well as bad tastes and odors, removes over 90% of chlorine, and is highly effective on VOCs like pesticides, herbicides, and industrial solvents.

The premium design material is committed to providing you with tasty and healthy filtered water. The system effectively filters, prevents clogging of water pipes and prolongs the service life of household appliances.

This filtration system is for any consumer looking for an easy inexpensive no-fuss whole house water filter. It promises to provide you with constant and continuous water flow without big water pressure drop.

Installation is easy thanks to its pre-assembled mounting bracket. with its simple installation process practically no maintenance outside of a yearly check-in and absolutely no chemical additives. it installs to become a permanent part of the homes water system.


  • Long-lasting service life.
  • Effectively prevents the clogging of the pipes.
  • Effective filtration.
  • Increase the water quality.
  • Protect your water equipment.
  • It’s backed up by many consumer reviews.


  • Potential to leak.

Waterdrop (NSF/ANSI 42 Certified) 10 Ua Under Sink Water Filter

The Water Drop has an innovative multistage filtration for direct connection to the under sink filtration system that can effectively reduce chlorine, heavy metals, chemical pollutants, sediments, and other large particles.

Enjoy fresh clean healthy water straight from your tap and not have to have other expenses of bottled water.

The filter has been tested by WQA and it meets NSF 372 standards. It features an activated carbon block and other advanced filter media to ensure effective and efficient filtration.

It removes contaminants while also retaining minerals that are essential for your body such as calcium, potassium, sodium, and magnesium.

The filter comes with an easy installation system with the innovative push to connect fittings; the entire process takes less than 3 minutes. The system should only be connected to the cold water supply.

The twist and lock design ensure that you can replace the filter without any problem. The system includes a durable 3/8 inch hose with a direct connection that adapts to standard 3/8 feedwater valves under US sinks.

Its filter long service life when used with municipal water ensures that it lasts for 12 months or 8,000 gallons of water. Its pressure is at 60 psi.


  • Easy installation.
  • Used at commercial and residential places.
  • Removes sediments and odors.
  • Saves you money from the expenses of buying bottled water.


  • Does not reduce TDS.

Frizzle with Direct Connect Under Counter Drinking Water Filtration System

The Frizzle Under Sink Water Filter System has a 2 stage advanced water filter water purifier with 0.5 microns.

This double water filtration has a high precise compound filter whose unique technology removes over 99.99% of contaminants while leaving all the essential minerals.

It reduces all the lead, heavy metals, chlorine, rust, organic compounds, carcinogens, and other contaminants.

The filter fits both ½ inch and 3/8 inch cold water lines; installation is butter smooth to install. a directly connected hose is used to fit the 3/8 inches feeding the water valves under the US kitchen sinks.

The inline water filter system also comes with 3/8 inch to ½ inch converter fittings that allows the system to install to the existing both ½ inch and 3/8 inch cold water line and faucet under your sink.

It takes less than 3 minutes to install the filter and no plumbing is required.

The filter has the best auto shut-off design by utilizing the twist in-installation for a quick change and doing a filter replacement.

This under sink water filter system contains a core filter cartridge inside the housing that’s replaceable. Once it’s done will only need to replace the core part of the filter cartridge rather than throwing away the whole plastic part.

This will save you much money on replacing the cartridge and will do a lot of help on the environmental protection.


  • High flow rate.
  • Money-saving and satisfaction.
  • Best auto shut design.
  • Two-stage advanced filtration for pure and clean water.


  •  The thread tapes do not work effectively.

APEC 3 Stage (WFS-1000)Super Capacity Premium Quality Under-Sink Water Filter System

This under the kitchen sink water filter uses a 3 chamber filtration system to filter the water. The system ensures that water is completely odorless, colorless, and the pH is maintained.

Water enters the first chamber. In this chamber, a sediment filter removes dirt and sand while two additional carbon-based chambers work to eliminate bacteria and germs.

The second two stages of carbon come next and work diligently to remove chlorine chemicals and odors. This chamber works to ensure the freshest pure water before it enters the home and comes in contact with home appliances.

It’s easy to install and getting one won’t break the bank as these filters are double sealed and inexpensive and only needs changing once or twice a year.

It features a leak stop valve that ensures the system won’t overflow whenever excess water is detected. All the materials that make up this filter are BPA-free.


  • Easy installation.
  • Cleaner, fresher, softer, odorless water.
  • Company warranty.
  • Filters water in three distinct stages.


  • Does not reduce TDS.


The filters above are among the best whole house and under-sink water filters. We have seen that water filters increase the quality of water that we use in our homes.

Since it’s critical that each source of water in your house is filtered it’s important that the water we cook with and drink is pure. Our skin is also designed to breathe so we release toxins from our body.

As such it is extremely efficient at absorption also, not to mention the water vapors that enter your body through your lung. You should use a water filter to protect yourself against such contaminants.

Because the decision to purchase a water purifying system is so critical you will need to thoroughly research the different types of systems on the market.

Read the specifications on each. Some systems are far more effective than others. For the most part, you will find a multi-stage water filter that will provide for maximum removal of contaminants.