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Reviews of the Best Under Sink Water Filters

The 5 Best Under Sink Water Filters of 2018

Best Under Sink Water Filter
Best Overall Under Sink Water Filter
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After installing over 300 of these filters in my career, I can say with confidence that the best under sink water filter is the APEC Top Tier 5-Stage RO Water Filter. It guarantees all unsafe contaminants will be removed at a very affordable price.

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Under Sink Water Filters: Our Top Picks

Best Overall
APEC 5-Stage
Our Rating:
4.8 Star Rating
5 Stages
Reverse Osmosis
Premium Choice
iSpring RCC7AK
Our Rating:
4.7 Star Rating
7 Stages
Reverse Osmosis
Budget Pick
Woder 10K Gen 3
Our Rating:
4.6 Star Rating
1 Stage
Carbon
Best 3 Stage
APEC WFS-1000
Our Rating:
4.6 Star Rating
3 Stage
Carbon
Highest Efficiency
iSpring RCC1UP
Our Rating:
4.8 Star Rating
6 Stage
Reverse Osmosis

Reviews of The Best Under Sink Water Filters of 2018

I have extensive experience installing, maintaining and testing water filtration systems. I built this list based on the fact that your filtration needs will vary depending on your incoming water source. The majority of homes in North America get water from municipal sources, and so, our list is tailored on that basis.

Best Overall: APEC 5-Stage RO Water Filter System

Best Overall Under Sink Water Filter
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(Our Rating – 4.8)

If you want guaranteed safety and great tasting water at an affordable price, then the APEC Top Tier 5-Stage Ultra Safe Reverse Osmosis Drinking Water Filter System is the best choice for you. Reverse osmosis filters 99.9%+ of all contaminants in the water, which is significantly higher than traditional 3 stage, carbon based filters.

You will need to ensure you are getting your daily source of vitamins and minerals through your diet, since this filter will remove all the beneficial minerals from your tap water. In addition, you will want to ensure you are using a fluoride based toothpaste since this filter will remove all fluoride from your tap water.

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Features we love:

  • Reverse osmosis at a great price
  • Guaranteed safety
  • Online best seller

Pros:

  • 5-Stage filter, which is higher than the average 3-Stage
  • Comes with holding tank and faucet

Cons:

  • Tank is slow to fill
  • Removes beneficial minerals from the water

If you have any concerns about your drinking water and want to ensure absolute safety without breaking the bank, this is the right under sink water filter for you.

Premium Choice: iSpring RCC7AK UV, RO, pH+

Premium Choice Under Sink Water Filter
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(Our Rating – 4.7)

If you want the best of the best in under sink water filtration, then the best filter money can buy is the iSpring RCC7AK-UV Deluxe. This filtration system has it all: Reverse osmosis, re-mineralization and UV sterilization.

If you want the absolute perfect drinking water, regardless of how poor your income water source is, then this is the right water filter for you. It would have scored a perfect 5.0, except the price is a little high.

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Features we love:

  • 7 Stage Water filter removes 99.9% of contaminants
  • UV filtration ensures no live microorganisms are present
  • Alkaline Remineralization ensures you are getting only the good minerals the body needs

Pros:

  • Best filtration system in the market
  • Comes with holding tank and faucet
  • Optimizes pH of water

Cons:

  • One of the more expensive units in the market
  • RO membrane causes the filtration to run slowly

If your income water source is well water or lake water, this under sink water filter will guarantee safe, delicious and healthy drinking water.

Budget Pick: Woder 10K-Gen 3 Water Filtration System

Best Budget Under Sink Water Filter
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(Our Rating – 4.6)

If you trust your water source is safe but want a cheap and easy water filter to install under the sink, the Woder 10K-Gen3 Ultra High Capacity Water Filtration System is right for you.

This simple filter requires virtually no installation and makes your water taste great. It’s perfect for apartments and condominiums. This filter will last the average person about 3 years, which is much more than the average water filter.

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Features we love:

  • Powerful single stage filter
  • Install in a few minutes
  • Very inexpensive
  • Lasts up to 3 years on a single filter

Pros:

  • Filters 99% of contaminants
  • Allows beneficial minerals to pass through
  • Fast flow rate

Cons:

  • Does not guarantee the safety of drinking water

If you want a basic water filter to improve the taste of your tap water and the best possible price, then this Woder water filtration system is right for you.

Best 3 Stage: APEC WFS-1000 3 Stage Filter

Best 3 Stage Under Sink Water Filter
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(Our Rating – 4.6)

If you’re not interested in going down the reverse osmosis route, but still want a high quality filter for your drinking water, then the APEC WFS-1000 3 Stage Under Sink Water Filter is the right choice for you.

This system can handle the majority of contaminants and make your water taste great. This high capacity system only needs filter changes every few years, which makes maintenance less expensive and cumbersome.

View Features and Pros/Cons

Features we love:

  • Powerful 3-Stage filtration
  • Lasts up to 3 years on a single filter
  • High Flow Rate
  • Comes with Faucet

Pros:

  • Filters 99% of contaminants
  • Allows beneficial minerals to pass through
  • Fast flow rate

Cons:

  • Does not guarantee the safety of drinking water

If you want to improve your tap water’s taste without a lot of maintenance and filter changes, this is the right filter for you.

Highest Efficiency: iSpring RCC1UP 6-Stage RO System

Highest Efficiency Under Sink Water Filter
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(Our Rating – 4.8)

Reverse osmosis filtration system tend to “waste” a lot of water to clean the RO membrane. For many RO filters, it may take up to 3 gallons of water to make 1 gallon of filtered water.

If you are concerned about the financial cost and environmental impact of traditional RO filters, but still want to take advantage of the benefits of Reverse Osmosis, then the iSpring RCC1UP 6-Stage Water Filter will be the right choice for you.

View Features and Pros/Cons

Features we love:

  • 6 Stage Water Filtration with RO
  • Wastes very little water
  • Can filter over 100 gallons per day
  • UV sterilizer ensures no live micro-organisms are present

Pros:

  • Filters 99.9% of contaminants
  • High Capacity; requires few filter changes
  • Easy DIY installation

Cons:

  • More expensive end of the market

If you want all the benefits of RO without the guilt of wasting a ton of water, then this is the right under sink water filter.

Under Sink Water Filters Comparison Table

FiltersOur RatingFilter StagesFilter TypePrice
Apec 5 Stage4.85Reverse Osmosis$$$
iSpring RCC7AK4.77Reverse Osmosis$$$
Woder 10K4.61Carbon$$
Apec WFS-10004.63Carbon$$$
iSpring RCC1UP4.86Reverse Osmosis$$$

Under Sink Water Filters: Buyer’s Guide & Maintenance

Before you buy an under sink water filter, you have to consider your needs to ensure you choose the correct filter.

Incoming Water Source

The most important buying factor is what kind of tap water you have. If your source is municipal, you are less likely to require a full reverse osmosis setup and have safe drinking water. If you know your water is contaminated, or your water source may contain microorganisms (such as wells and lakes), then you’ll want a filter with reverse osmosis and UV sterilization.

Daily Usage

A single person will have significantly less drinking water needs than a family of 6. The more people in your household, the higher capacity filter you’ll want to purchase. This will ensure you aren’t changing filters too frequently, which saves both time and money.

Your Diet

If you don’t have the most balanced diet or aren’t taking a daily mineral supplement, reverse osmosis may be removing too much from your water. If you plan to drink a lot of reverse osmosis water, it’s important to have a re-mineralizer or pay special attention to getting your daily recommended nutrients.

Under sink space

If you don’t have a lot of space under your sink, you may want to opt for a single or 3 stage filter that doesn’t include a holding tank. If space is ample, you can easily handle a 6 stage or more plus holding tank setup, which all the premium models contain.

Budget

The prices vary significantly on under sink water filters. For the majority of people with municipal water, you won’t need a very powerful filter; a basic one to improve the taste will likely meet your needs. If you are on a budget but still require RO, you may need to sacrifice UV sterilization, flow rate, and efficiency.

Conclusion

For the majority of households, you can ensure 100% safety and great taste with our pick for the best under sink water filter: The  APEC Top Tier 5-Stage RO Water Filter. You get full reverse osmosis at an affordable price by a best-selling brand.

  • Editor's Rating
4.9

If having safe and clean drinking water, an under sink water filter is probably the right choice for you. If you are looking for a less expensive solution, you may want to consider a countertop water filter or water filter pitcher.

Walt Anderson

Walt Anderson

I'm Walt Anderson, a general contractor from Montana. I specialize in water treatment and I have installed water filtration systems, water softeners and water heaters in residential homes for over 20 years. When I'm not working on this site, I'm at my cabin in the backwoods of Montana with my two dogs, Kurt and Russell.

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