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iSpring US31 Classic 3-Stage Under Sink Water Filtration System for Drinking, Tankless, High Capacity, Sediment + Carbon + Carbon (Newest Version)

4.5 4.5 out of 5 stars 1,528 ratings

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3-Stage Water Filter

Purchase options and add-ons

Brand iSpring
Product Dimensions 16"L x 6"W x 16"H
Package Information Cartridge
Power Source Ac
Item Weight 12.02 Pounds
Model Name US31
Upper Temperature Rating 100 Degrees Fahrenheit
Material
carbon block
Capacity
2000 Gallons
Included Components
housings, filters, parts and tubings, faucet and mounting bracket See more
Purification Method
3 Stage. Chemical Absorption and Mechanical Filtration See more

About this item

  • [Classic Drinking Filter]: The water undergoes a three-stage purification process: PP sediment filtration, GAC carbon filter and a unique CTO filtration in the 3rd layer. This system efficiently removes common drinking water sediments such as dust, sand, particles, dirt, and rust. Additionally, it effectively eliminates heavy metals, harmful chemicals, Chloramine, cloudiness, colors, chlorine taste, and odor. It's important to note that this under sink water filtration system DOES NOT lower TDS value but preserves the healthy minerals in your water. Enjoy pure, great-tasting water with essential minerals intact.
  • [Fresh Healthy Water Supplier]: The on-demand fast flow rate of the iSpring US31 allows it to meet the widest possible range of needs in your home. Up to 20x more effective than the common water pitcher dispenser. Flow Rate: Up to 1GPM depending on source water pressure. Maxim Pressure: 90psi. It washes fresh produce like fruit and vegetables, brings health protection, can provide your entire family with delicious, clean water straight from your tap.
  • [Excellent Quality and Design]: Features beautiful European-designed brushed nickel all-metal faucet and clear see-through 1st stage housing. Clear see-through 1st stage housing makes filter inspection a snap. Manufactured to comply strictly with FDA standards and tested by independent third party against NSF/ANSI standards (42, 53, 61) for water quality, material safety and structural integrity.
  • [Easy to Install and Maintain]: This system is designed for easy installation, low maintenance, and features dual carbon block filters along with a high-capacity sediment filter. The sediment filter protects and extends the life of your system, while the carbon block filters work to remove many harmful contaminants a. You can replace the filter every 6 to 12 months, judged by the water’s taste.
  • [TDS Note and Customer Services]: This under sink water filter will not reduce the TDS of the incoming water. Instead, it keeps the healthy minerals in your water. If you are interested in a filter that removes TDS, please consider a Ispring reverse osmosis system.Backed by a 1-year Manufacturer with lifetime support from Atlanta, GA USA. For any issue or concern, please don't hesitate to contact us.

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Product details

  • Is Discontinued By Manufacturer ‏ : ‎ No
  • Product Dimensions ‏ : ‎ 16 x 6 x 16 inches; 12.02 Pounds
  • Item model number ‏ : ‎ US31
  • Date First Available ‏ : ‎ March 15, 2018
  • Manufacturer ‏ : ‎ iSpring Water Systems
  • ASIN ‏ : ‎ B07CHXVRS5
  • Country of Origin ‏ : ‎ Taiwan
  • Customer Reviews:
    4.5 4.5 out of 5 stars 1,528 ratings

Product Description

This 3-stage filter system is designed for easy installation, low maintenance, and features dual carbon block filters along with a high-capacity sediment filter. The sediment filter protects and extends the life of your system, while the carbon block filters work to remove many harmful contaminants, providing you with bottled quality water on demand.


From the brand


From the manufacturer

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At iSpring, we look beyond technology to make high quality drinking water accessible for all households. We provide our customers with professional water solutions to any water concerns they may have.

Why US31?

No more paying to have water delivered, the US31 Under-Sink Water Filter provides up to 2000 gallons directly from your tap at a fraction of the cost.

This system is designed for easy installation, low maintenance, and features dual carbon block filters along with a high-capacity sediment filter. The sediment filter protects and extends the life of your system, while the carbon block filters work to remove many harmful contaminants and providing you with bottled quality water on demand.

  • Flow Rate: Up to 1GPM depending on source water pressure
  • Maximum Pressure: 90psi

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1

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The on-demand fast flow rate of the US31 allows it to meet the widest possible range of needs in your home. Whether it's washing fresh produce like fruit and vegetables, or providing us with some extra peace of mind about the safety of our best friends, this system can provide you entire family with delicious, clean water straight from your tap.

Please note: This under sink water filtration system DOES NOT lower TDS value, instead it will keep healthy minerals in your water. If you are interested in a filter that eliminates TDS, please consider our iSpring tankless under sink Reverse Osmosis (RO) system RO500 or countertop RO water filter system RCT600 for more details.

a 2 3 RCD100 5
US31 US21B RCC7 RCD100 US15D
Customer Reviews
4.5 out of 5 stars
1,528
4.4 out of 5 stars
86
4.7 out of 5 stars
3,381
4.6 out of 5 stars
355
4.7 out of 5 stars
85
Filter Size 10” x 2.5” 10” x 4.5” 10” x 2.5” 12” x 2.8” 15” x 2.5”
Removes Chlorine, Chemicals, Heavy Metals, Odors, and More
Removes TDS - - -
Filtered Water to Waste Water Ratio No Waste Water No Waste Water 1: 1.6 2.5:1 No Waste Water
Tankless Design -
Direct Connect (No Extra Faucet) - -

What's in the box

  • housings, filters, parts and tubings, faucet and mounting bracket
  • Product guides and documents

    Looking for specific info?

    Customer reviews

    4.5 out of 5 stars
    4.5 out of 5
    1,528 global ratings

    Customers say

    Customers like the ease of installation using the water purification unit. They mention that the instructions are pretty good and the YouTubes are also helpful. They say that the water tastes better and removes all the off flavors and smells. Customers appreciate the value for money, saying that it's well worth the purchase. They also like the filtering quality, completeness, and water quality. However, some customers have reported issues with leakage.

    AI-generated from the text of customer reviews

    208 customers mention194 positive14 negative

    Customers find the installation of the water purification unit to be easy. They mention that the instructions are clear and easy to follow. They appreciate the quick connect fittings for where the water lines attach to the unit, making it easy to service the filters. They also like that the system is easy to Tee one of the lines if they want to provide filtered water to other areas.

    "...It is also super easy to Tee one of the lines if you want to provide filtered water to more than one location (e.g. Ice Maker, Coffee maker)...." Read more

    "I am truly pleased with the quality of this system. Instructions are very detailed. Everything is professionally packed and organized inside the box...." Read more

    "...The installation process was pretty simple and just about anyone who has installed a faucet should be able to intall this filter if they read and..." Read more

    "...The installation instructions were easy to follow. I was lucky in that the cold water diverter valve fit my installation without any extra work...." Read more

    174 customers mention151 positive23 negative

    Customers like the quality of the water purification unit. They say it's a great system with affordable filters. Customers also mention that the product works great, is well-made, and has an excellent customer service. They also say that the price is fair and the company has an outstanding reputation.

    "...The price is fair, the company has an excellent reputation, the filters are built well, and it comes with every piece and part needed to hook it up...." Read more

    "I am truly pleased with the quality of this system. Instructions are very detailed. Everything is professionally packed and organized inside the box...." Read more

    "...First off, I liked the quality of all the components. The installation instructions were easy to follow...." Read more

    "...It fits, works, and handles fine for me tho. But check the dimensions on the page. Mine was a tight squeeze but I should have checked that prior...." Read more

    137 customers mention117 positive20 negative

    Customers like the taste of the water purification unit. They say it makes the water taste better, removes all the off flavors and smells, and makes a big difference in the taste and quality of their drinking water.

    "...This 3-Stage system is outstanding. The water taste great and there is zero waste like there is with an RO system...." Read more

    "...Great tasting water! Recommended!!!" Read more

    "We love iSpring’s filter system. Our drinking water tastes very fresh & clean...." Read more

    "...This replaced that system and the water tastes as good." Read more

    68 customers mention68 positive0 negative

    Customers appreciate the value of the water purification unit. They say the compression fittings are very inexpensive, and the filters are affordable. They also say the installation process was easy and the product is well worth the purchase. Customers also mention that the filter sets are cheap, under $20, and last a long time.

    "...The price is fair, the company has an excellent reputation, the filters are built well, and it comes with every piece and part needed to hook it up...." Read more

    "...The replacement cartridges are also very inexpensive, so I ordered an extra set to have on hand, and set up am Amazon subscription purchase for..." Read more

    "...Filters last a long time and are VERY cheap to replace- Water tastes really good- Customer Support was excellent-..." Read more

    "...The replacement filter packs are considerably cheaper too. So glad we switched to iSpring!..." Read more

    67 customers mention51 positive16 negative

    Customers like the filtering quality of the water purification unit. They say the build quality is pretty darn good, the system is streamline, and produces great filtered water. Customers also say it's one of the best water filtration systems on the market, and a great choice for filtered Water in the home. The 3 filters are very good and help the taste of the Water. The filter works quickly, filtering enough water for a pot of coffee in a few minutes.

    "...I believe this is one of the best water filtration systems on the market...." Read more

    "...The filter works quickly, filtering enough water for a pot of coffee in a few seconds. These are so much better than pitcher-style filters...." Read more

    "...Quite happy with it.- Great filters in terms of quality of filtration. If flouride is a problem for you, consider their RO filter tho.-..." Read more

    "...They give you more tubing than you can probably use. The water came out cloudy, air bubbles, as they said it would for first time use...." Read more

    39 customers mention35 positive4 negative

    Customers like that the water purification unit comes with everything they need. They say it's well built, and comes with all the parts they need, including hardware. Some customers also mention that the system is easy to install and comes complete with fittings and tubing. Overall, customers are happy with the value and quality of the product.

    "...excellent reputation, the filters are built well, and it comes with every piece and part needed to hook it up...." Read more

    "...All of the necessary hardware was included, along with more than enough plastic tubing to make the needed connections...." Read more

    "The unit was very easy to install, came with everything needed...." Read more

    "...Other than that it comes with everything I needed and was a breeze to install. Take special note of the flow direction on the filter...." Read more

    39 customers mention39 positive0 negative

    Customers are satisfied with the water quality of the water purification unit. They mention that it provides excellent clean water, with a clear taste. They also say that the three filters should provide good water throughput. Overall, customers find it to be a great under-sink water filtration system and a perfect solution for drinking water.

    "...That cleared up after a short time using the filter. The water comes out as good, or better, as bottled without the extra fuss of buying bottles or..." Read more

    "...This system is extremely quiet, you can’t hear it at all, & it doesn’t waste any water unlike the tons of water wasted by our old Watts Reverse..." Read more

    "Water quality is a lot of better. For example taste, clear water and the quality bette...." Read more

    "...This is way faster and way better water. It does take up quite a bit more space than I thought it would, but fit just fine under the sink...." Read more

    100 customers mention28 positive72 negative

    Customers are dissatisfied with the leakage of the water purification unit. They mention that it was leaking, had a problem with a leak between filters, and had dripping issues. Some say that if the unit fell over it could cause problems with filtration.

    "...If it fell over it could cause problems with filtration. The advantage to the size, however, is it has room to hold quality filters...." Read more

    "...So it was leaking, I immediately used the new cutoff and it stopped it immediately...." Read more

    "...was easy and the quick connect fittings worked great with no leaks. I checked the replacement filter costs and they are very reasonable...." Read more

    "...One of the unions between the filters was cracked and leaking. Reached out to customer support (email) and got a quick response...." Read more

    Excellent customer service (Mike & Sean)
    5 Stars
    Excellent customer service (Mike & Sean)
    Water quality is a lot of better. For example taste, clear water and the quality bette. Excellent representative (Mike & Sean) that went above and beyond by helping me get a better understanding of my water quality report from the city municipal water in nyc. Also their customer will work with you step by step to solve any problems
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    Top reviews from the United States

    Reviewed in the United States on February 3, 2019
    Style: 3-Stage Water FilterVerified Purchase
    53 people found this helpful
    Report
    Reviewed in the United States on January 25, 2024
    Style: 3-Stage Water FilterVerified Purchase
    Reviewed in the United States on November 29, 2023
    Style: 3-Stage Water FilterVerified Purchase
    3 people found this helpful
    Report
    Reviewed in the United States on February 22, 2024
    Style: 3-Stage Water FilterVerified Purchase
    Reviewed in the United States on February 3, 2024
    Style: 3-Stage Water FilterVerified Purchase

    Top reviews from other countries

    Translate all reviews to English
    Andrew
    5.0 out of 5 stars I am very happy with this product.
    Reviewed in Canada on December 18, 2023
    Style: 3-Stage Water FilterVerified Purchase
    Customer image
    Andrew
    5.0 out of 5 stars I am very happy with this product.
    Reviewed in Canada on December 18, 2023
    The unit is well built & it feels very sturdy. Unfortunately, it was missing the front & back washers for the faucet. I emailed customer service about it. The following day, Nick replied & said he would use express courier to send me the missing parts. I also asked Nick if it was possible to send an adapter that would allow me to connect to an existing valve instead of using the valve supplied by iSpring. To my amazement, Nick made the promise. The parts arrived a few days later. Installation was very easy. There was no leakage at all. You have to make sure not to over tighten the connections. I decided to purchase tubing from my local hardware store that had 0.17" inside diameter instead of using the one supplied by iSpring that had a smaller 0.142" inside diameter. I believe that made the flow rate better. There is no issue with the taste of the water, this coming from someone who switches from a Reverse Osmosis system. The only thing I don't like is there is always a droplet of water hanging at the end of the faucet after every usage. However, it's only a minor issue. I would like to thank Nick for his excellent work & all his help!
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    Enrique
    5.0 out of 5 stars Fácil de instalar
    Reviewed in Mexico on November 27, 2023
    Style: 3-Stage Water FilterVerified Purchase
    Jason smith
    5.0 out of 5 stars Great system
    Reviewed in the United Kingdom on March 5, 2024
    Style: 3-Stage Water FilterVerified Purchase
    Rashed
    5.0 out of 5 stars Sehr gut,ich bin totalzufredan
    Reviewed in Germany on February 21, 2024
    Style: 3-Stage Water FilterVerified Purchase
    Isaac
    5.0 out of 5 stars ok
    Reviewed in Spain on January 10, 2024
    Style: 3-Stage Water FilterVerified Purchase