iSpring US31 Classic 3-Stage Under Sink Water Filtration System for Drinking, Tankless, High Capacity, Sediment GAC Carbon (Newest Version)
-6%
$127.99
$135.99
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]: Designed for hassle-free installation and maintenance, the system includes a high-capacity sediment filter, GAC filter, and CTO carbon filter. The sediment filter protects and extends the life of your system, while the GAC and carbon filters efficiently remove harmful contaminants. Filters should be replaced every 6 to 12 months, depending on water quality.
- [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.
Frequently Bought Together

iSpring US31 Classic 3-Stage Under Sink Water Filtration System for Drinking, Tankless, High Capacity, Sediment GAC Carbon (Newest Version)
$127.99
-6%
$135.99
$135.99
- Availability: In Stock
- Model: US31
- Manufacturer: iSpring
Write Review
Robert J. Bosak | 
2021-07-06
This is the third water filtration unit I have purchased and am now kicking myself was not the first. First off this three stage unit comes with such explicit directions probably a two year old could install it. Next this unit comes with a cutoff for the system itself which is what truly inspired my review. See the previous units I suppose never anticipated problems can occur or even the simple fact of changing the cartridges so they never supplied a cutoff for the filtration system. This leaves you having to turn off the original cutoff for your cold water which leaves you dead in the water for using cold water in your kitchen sink. I suffered that fact with the unit this Ispring 3 stage replaced. Due to one of the hoses breaking we were left without cold water in our sink for two days. The fact this company reacted quickly and we received the unit so fast prevented it from being 3 days! I had the opportunity of trying the cutoff valve as one of the hoses for the outputed purified water goes to our refrigerator. Well I was stupid as I should have cut an inch off the hose since it was the original. So it was leaking, I immediately used the new cutoff and it stopped it immediately. I guess we are all human, make mistakes and is something ISpring really needs a commendation for having that ability to understand! Replacing the cartridges is going to be a total joke since each one unscrews very simply. Not only that, the cost is $20. I paid $110 for the replacement cartridges for the last 3 stage unit I had which failed a month after that replacement. So you bet I am kicking myself for not purchasing this ISpring 3 stage before that kind of a loss. The amount of hose that comes with it is extremely generous and I believe someday I will replace the old refrigerator line. Thanks for being a company that makes product that makes us all happy instead of confused and upset. I wish one day others will follow in this manner of greatness

2021-07-06
This is the third water filtration unit I have purchased and am now kicking myself was not the first. First off this three stage unit comes with such explicit directions probably a two year old could install it. Next this unit comes with a cutoff for the system itself which is what truly inspired my review. See the previous units I suppose never anticipated problems can occur or even the simple fact of changing the cartridges so they never supplied a cutoff for the filtration system. This leaves you having to turn off the original cutoff for your cold water which leaves you dead in the water for using cold water in your kitchen sink. I suffered that fact with the unit this Ispring 3 stage replaced. Due to one of the hoses breaking we were left without cold water in our sink for two days. The fact this company reacted quickly and we received the unit so fast prevented it from being 3 days! I had the opportunity of trying the cutoff valve as one of the hoses for the outputed purified water goes to our refrigerator. Well I was stupid as I should have cut an inch off the hose since it was the original. So it was leaking, I immediately used the new cutoff and it stopped it immediately. I guess we are all human, make mistakes and is something ISpring really needs a commendation for having that ability to understand! Replacing the cartridges is going to be a total joke since each one unscrews very simply. Not only that, the cost is $20. I paid $110 for the replacement cartridges for the last 3 stage unit I had which failed a month after that replacement. So you bet I am kicking myself for not purchasing this ISpring 3 stage before that kind of a loss. The amount of hose that comes with it is extremely generous and I believe someday I will replace the old refrigerator line. Thanks for being a company that makes product that makes us all happy instead of confused and upset. I wish one day others will follow in this manner of greatness
-
iSpring FC15 NSF/ANSI 58 Certified Standard 10 inch CTO Carbon Block Water Filter Cartridge Replacement, 5 Microns
$18.99 -
iSpring FP15 NSF/ANSI 58 Certified 5 Micron 10"x2.5" Standard Sediment Water Filter Filter Cartridges
$15.99 -
iSpring GA1-B Reverse Osmosis Faucet, Lead-Free Contemporary Drinking Water Faucet for RO Systems, High Spout, Chrome Finish
$39.99 -
iSpring GA1-BN Heavy Duty Non-Air Gap Drinking Faucet for Water Filtration, Reverse Osmosis Systems-Brushed Nickel-Contemporary Style High-Spout
$39.99 -
iSpring F6CTO Prefilters for CW31 and Standard Reverse Osmosis RO Water Filter Systems 1-Year Replacement Supply Filter Cartridge Pack Set, No Membrane
$43.99 -
iSpring CU-A4 0.01μm Ultra-Filtration Under Sink Water Filter System, Tankless 4-Stage High Capacity, Remove 99.99% Contaminants, Quick Filter Change with Brushed Nickel Faucet, White
$207.99 -
iSpring F3CTO 10-inch Standard Replacement Filter Set Cartridges for RO and 3-Stage Water Filtration Systems Sediment, 2 x Carbon Block Filters
$32.99 -
iSpring ASKRCC Slide-Out Mounting Kit for Under Sink Reverse Osmosis Water Filter System, Fits RCC Series
$69.99
-
Start Download
US31 Manual
How to install
Replacement Filters & Parts
Filters:
Fittings:
Pipes:
Does this system require electricity to operate?No, the US31 under-sink water filtration system does not require electricity. It works on water pressure alone. How much water pressure is required for it to work?The feed water pressure should be: 30-70 psi How long do the filters last before needing replacement?The filters should be replaced every 6 to 12 months, depending on usage and water quality. This ensures optimal performance and water quality. Will it reduce TDS?No, this under-sink water filtration system does not reduce TDS levels. Instead, it maintains the TDS of the incoming water, preserving essential minerals. If TDS reduction is necessary, we recommend considering an iSpring reverse osmosis system. |