---
product_id: 11324872
title: "iSpring CU-A4 4-Stage Ultra Filtration Under Sink Water Filter System | 0.01μm, Space-saving, Reduces 99.99% Contaminants, Quick Filter Change, With Brushed Nickel Faucet, Up to 12 Months"
brand: "ispring"
price: "€ 385.24"
currency: EUR
in_stock: true
reviews_count: 13
category: "I Spring"
url: https://www.desertcart.gr/products/11324872-ispring-cu-a4-4-stage-ultra-filtration-under-sink-water
store_origin: GR
region: Greece
---

# 0.01μm ultrafiltration membrane 4-stage multi-technology filtration Twist-on filter replacement iSpring CU-A4 4-Stage Ultra Filtration Under Sink Water Filter System | 0.01μm, Space-saving, Reduces 99.99% Contaminants, Quick Filter Change, With Brushed Nickel Faucet, Up to 12 Months

**Brand:** ispring
**Price:** € 385.24
**Availability:** ✅ In Stock

## Summary

> 💧 Elevate your tap water game—pure, powerful, and hassle-free filtration for the modern kitchen.

## Quick Answers

- **What is this?** iSpring CU-A4 4-Stage Ultra Filtration Under Sink Water Filter System | 0.01μm, Space-saving, Reduces 99.99% Contaminants, Quick Filter Change, With Brushed Nickel Faucet, Up to 12 Months by ispring
- **How much does it cost?** € 385.24 with free shipping
- **Is it available?** Yes, in stock and ready to ship
- **Where can I buy it?** [www.desertcart.gr](https://www.desertcart.gr/products/11324872-ispring-cu-a4-4-stage-ultra-filtration-under-sink-water)

## Best For

- ispring enthusiasts

## Why This Product

- Trusted ispring brand quality
- Free international shipping included
- Worldwide delivery with tracking
- 15-day hassle-free returns

## Key Features

- • **Premium Aesthetic:** Includes sleek brushed nickel faucet that elevates your kitchen’s style and function.
- • **Space-Smart Design:** Compact under-sink system with no wastewater or bulky storage tank required.
- • **Effortless Maintenance:** Twist-on filters with push-to-connect fittings make replacements a breeze—no plumber needed.
- • **Crystal-Clear Hydration:** Removes 99% of chlorine, lead & contaminants while preserving essential minerals.
- • **Trusted Quality & Support:** NSF/ANSI certified parts backed by 1-year warranty and lifetime customer care.

## Overview

The iSpring CU-A4 is a 4-stage under-sink water filtration system featuring a 0.01 micron ultrafiltration membrane combined with KDF and activated carbon filters. It removes up to 99% of chlorine, lead, arsenic, and other contaminants while retaining beneficial minerals. Designed for easy installation and maintenance, it requires no wastewater or storage tank and includes a premium brushed nickel faucet. Certified to NSF/ANSI standards, it supports up to 8,000 gallons with filter life of 6-12 months, making it a reliable, space-saving solution for clean, great-tasting water.

## Description

iSpring CU-A4 4-Stage Ultra Filtration Under Sink Water Filter System | 0.01μm, Space-saving, Reduces 99.99% Contaminants, Quick Filter Change, With Brushed Nickel Faucet, Up to 12 Months - Undersink Water Filtration Systems - desertcart.com

Review: Ispring cares about customer satisfaction - Update: As per my review below, I had some trouble installing due to instructions that were not really clear or suited to this particular product, which Ispring says is brand new. Since then they actually tracked me down and cared about what I had to say. According to them they are rewriting the instructions, not shipping with the funny dust caps, and considering additional parts to make the installation go smoother. I was impressed because in this day and age few companies actually seem to care about what their customers really think. I have come to the conclusion that this company does. And the filter system is now working fine, so don't hesitate to buy. I'm leaving my review below in case it takes a while to update the instructions. It might shave a few hours off someones install time. Changed to 5 stars. If you have any problems they will definitely help, and that is a really good thing. ================================================================ Just finished the installation. I'm a pretty handy monkey, but the installation took about 5 hours of my time (including 3 trips to the home improvement store and a some-what helpful phone call to ispring). First-off the manual is misleading and clearly written for another product or previous version of this product (or maybe a new-fangled sausage making machine). The parts of the manual that do apply to this product, like how to connect the little push-on connectors, suffer from an excess of brevity and lack of detail and conciseness. In an attempt to be helpful to future purchasers of this product, at least until ispring updates these kits and instructions, here's what I learned: First tip: the faucet included in my box does not require a 1/2 inch hole, as the instructions state, but a one inch hole. Actually one inch is too tight, make sure you have a 1 1/8 inch hole saw attachment for your drill, and make it a good bi-metal one if you need to cut through a stainless steel sink. Home depot sells rigid brand bits that suit this purpose. It will run you about $15 unless you already have a rigid brand bit shaft (or equivalent). Second tip: the faucet that came with my filter has three colored plastic hoses already permanently attached. Red, white and blue (I dig the patriotism). Unfortunately which gets attached where is not mentioned anywhere in the manual. In the manual it says to screw the water hose to the bottom of the faucet. Clearly referring to a different type of faucet. Also if the three hoses were just a little longer you would probably not need to bother adding extension hose (an extra leak risk). More on extension hoses later. The colors are mentioned in the desertcart description, way at the bottom, but it bears repeating. "Connect the BLUE tubing of 3-color tubings on the faucet to cold water line, RED to the 1st stage on the right, WHITE to the 3rd stage on the left." Note: This is #ssbackward if you are from an English speaking country ... just saying. Third tip: The filter box itself has funny little horn or funnel shaped things on the ends of the inlet (left) and output (right) angle connectors. These are not mentioned at all in the manual. You can not push the hoses on with these in place (you can try as I did ... if you get excited by frustration) because these are some weird sort of dust plugs. You must pull up with your fingernail on the very outer ring of the connector (pushing it on a spring ever so slightly towards the more bulbous part) then with other hand pull the horn thing out. You can discard these, or I found they make nice hats for very small garden gnomes. Basically you can connect the red and white hoses now by pushing them with force into the connector until they snap. Pull back a little to make sure it is connected. If you need to cut extension hose cut it straight, and use the supplied double-sided connectors. I recommend you push the little blue horseshoe shaped clips (supplied) between that outer part of the connector and the more bulbous part. These (I think?) are to make sure the connectors can't shoot apart from water pressure. No mention in manual about these. You can leave them off, as I did at first, if the under side of your sink needs a good spraying out. Fourth tip: In order to connect the blue hose to the cold water line you need to first install some parts. My sink had a 3/8 inch stainless steel hose with female compression fitting attached to a male 3/8 compression fitting shutoff valve coming out of the wall. Pretty typical I would assume. The kit comes with a 1/2 inch plumbing style thread, male to female connector, with a hole to thread the valve the blue hose goes onto, in the middle. A way to tap into your cold water line, would be eazy peezy if it was threaded for 3/8 compression fittings, but it's half inch and has coarser plumbing style threads. So off to the Home Depot you go. Don't forget another roll of Teflon tape to add to your Teflon tape collection while you are there. Actually the folks at the Home Depot weren't that helpful (surprised?), but the small local hardware store in my old town was. You will need, as it turns out (if your sink is like mine) a 1/2 inch plumbing style male to 3/8 inch compression male adapter to connect your current hose leading to your cold faucet to this new part (btw thread the little supplied valve the kit came with into this part with a little teflon tape first so you can get it good and tight before you are lying on your back under the sink). Then on the other end you will need another short stainless hose (only way I can find to do this with available parts ... why it took three trips) 1/2 inch plumbing female, which attaches to other end of this new part, 3/8 compression female which connects to the part your faucet hose used to be connected to. These parts should run less than $15. Tip five : To connect the blue hose to the metal valve from the previous section you need to put it against the nipple, screw off the nut collar and slide it down the hose temporarily, then push it on the nipple all the way, and man it's a tight little bugger (I sprayed the nipple with a little Pam cooking spray, hey it was in the kitchen), then put that nut collar back on and tighten it down real tight with a half inch wrench. Why these filters don't come with a 3/8 inch compression fittings on each side of the filter box, so you can just screw your standard hoses on that you can get from any hardware store, is beyond me. There must be a reason. Maybe these filters are designed by the same folks who design those charming "blister packs" that you need a chainsaw to open? When I tested the water it was cloudy and tasted a little funny, it got better after I ran the tap for a while. Now it tastes pretty darn good. Even my cat likes it. Hopefully it will not develop leaks.
Review: High Quality Tank - Very easy to install and it's an easy replacement for the tank that wore out. Once installed, water pressure is very high, and we now have a strong stream running from the faucet. Also went through the easy process to register the tank for the warranty. No issues and I was guided through the process by a representative named Robert. iSpring products are great and I highly recommend them.

## Features

- SUPERIOR PERFORMANCE: The advance 4-stage design, which includes both Ultrafiltration and KDF/GAC stages, removes up to 99% of chlorine and chlorine treatment by-products, lead, and much more, while retaining minerals. Noted: This system is NOT a Reverse Osmosis water filtration system and does NOT lower TDS.
- 4-Stage ULTRAFILTRATION SYSTEM: PP Sediment Filter (5 microns) removes larger particles like rust, sand, dirt. Ultrafiltration membrane contains hollow fiber membrane technology with a pore size of just 0.01 microns. KDF and GAC Filter provides much better control of particularly problematic contaminants including chloramine, hydrogen sulfide, heavy metals, and other compounds. Fine Activated Carbon Filter provides final polishing.
- SIMPLE AND FLEXIBLE: NO WASTE WATER and No storage water tank required. The CU-A4 provides highly effective water filtration for any number of clean water needs - at the sink, in the refrigerator, for coffee makers and more.
- FEATURES: Come with premium brushed nickel finish drinking water faucet. All filters, tubing and other water-contacting parts are manufactured to comply strictly with NSF/ANSI standards for safety and water quality.
- EASY-TO-INSTALL AND REPLACE FILTER: Push to connect fittings for simplify setup. Filter replacement are designed for ease. No need to disconnect hoses or water lines. Just Twist On / Twist Off filter cartridges make changing filters a snap. Filter life: 6 -12 months, depending on your source water and usage.

## Technical Specifications

| Specification | Value |
|---------------|-------|
| ASIN | B009AEJWZG |
| Best Sellers Rank | #3,942 in Tools & Home Improvement ( See Top 100 in Tools & Home Improvement ) #10 in Under-Sink & Countertop Filtration |
| Brand | iSpring |
| Brand Name | iSpring |
| Capacity | 8000 gallons |
| Container Type | Faucet |
| Customer Reviews | 4.6 out of 5 stars 7,210 Reviews |
| Filter Life Cycle | 6 months |
| Global Trade Identification Number | 00662425053063 |
| Included Components | Under sink water filter system, parts and tubings, faucet |
| Installation Type | Under Sink |
| Item Dimensions L x W x H | 10.63"L x 4.33"W x 12.6"H |
| Item Type Name | 4-Stage High Capacity Premium Under Sink Drinking Water System with 0.1 micron Ultra Filtration membrane |
| Item Weight | 2 kg |
| LowerTemperature Range | 40 °F |
| Manufacturer | iSpring |
| Material | 0.01μm Ultra-Filtration, Lead-free & BPA-free Material, Leak-Free, Space-Saving & Easy to Install Material 0.01μm Ultra-Filtration, Lead-free & BPA-free Material, Leak-Free, Space-Saving & Easy to Install See more |
| Material Type | 0.01μm Ultra-Filtration, Lead-free & BPA-free Material, Leak-Free, Space-Saving & Easy to Install |
| Model Name | CU-A4 |
| Model Number | CU-A4 |
| Number of Items | 1 |
| Other Special Features of the Product | 4-Stage 0.01 micron ultra-filtration, Heavy Duty, Leak Proof, Reduces chlorine, lead, arsenic, odor, metal and more |
| Part Number | CU-A4 |
| Power Source | No Need |
| Product Dimensions | 10.63"L x 4.33"W x 12.6"H |
| Purification Method | Mechanical Filtration, Chemical Absorption, Redox, and Ultrafiltration |
| Special Feature | 4-Stage 0.01 micron ultra-filtration, Heavy Duty, Leak Proof, Reduces chlorine, lead, arsenic, odor, metal and more Special Feature 4-Stage 0.01 micron ultra-filtration, Heavy Duty, Leak Proof, Reduces chlorine, lead, arsenic, odor, metal and more See more |
| UPC | 662425053063 |
| Unit Count | 1 Count |
| Upper Temperature Rating | 100 °F |
| Warranty Description | 30-Day money-back guarantee. 1-Year Manufacturer Warranty. Lifetime support from Atlanta, GA. |

## Product Details

- **Brand:** iSpring
- **Capacity:** 8000 gallons
- **Included Components:** Under sink water filter system, parts and tubings, faucet
- **Installation Type:** Under Sink
- **Package Information:** Faucet
- **Power Source:** No Need
- **Product Dimensions:** 10.63"L x 4.33"W x 12.6"H
- **Purification Method:** Mechanical Filtration, Chemical Absorption, Redox, and Ultrafiltration

## Images

![iSpring CU-A4 4-Stage Ultra Filtration Under Sink Water Filter System | 0.01μm, Space-saving, Reduces 99.99% Contaminants, Quick Filter Change, With Brushed Nickel Faucet, Up to 12 Months - Image 1](https://m.media-amazon.com/images/I/81zOpUpCr+L.jpg)

## Available Options

This product comes in different **Set** options.

## Questions & Answers

**Q: How many gallons of water will be treated during a filter's lifespan, before they need to be replaced?  Also, is there a change indicator?**
A: The actual gallon life will vary from customer to customer. As with all replaceable filter cartridges, they have limited space to hold the contaminants they remove from your water. This means that the higher concentration of junk you have in your source water, the faster the filters will run out space to keep filtering and vice versa. The average is about 1100 gallons, but this number may not represent your source water, so individual results could either be more or less than the average.

**Q: Has anyone tested the water that comes out of the filter with a TDS meter? I checked mine today and found that the TDS was the same as the tap water**
A: Per Josh @ iSpring 3/7/2017 - this will not remove minerals present in your city's tap water, so there should be little difference in total dissolved solids (TDS) count.

**Q: Can I connect existing water line(previously connect to refrigerator,tiny size) to this unit or I have use a adaptor? and can I only connect to refrig**
A: I answered this before, but after re-reading your question I need to revise my original answer. If you are planning on using this as a primary filtered water supply you will probably find that there is not enough water flow through the original water line that is supplying water to your refrigerator. Maximum flow rate is a function of the diameter of the supply line (among other factors). You could make it work if you had to, but I am thinking the flow rate might be kind of feeble. Why not take the supply from under the sink in the kitchen?

**Q: Does this remove flouride?**
A: Hi ajb, Unfortunately this unit does not remove fluoride. You will need reverse osmosis in order to remove fluoride. ThanksClaudia

## Customer Reviews

### ⭐⭐⭐⭐⭐ Ispring cares about customer satisfaction
*by J***O on May 16, 2013*

Update: As per my review below, I had some trouble installing due to instructions that were not really clear or suited to this particular product, which Ispring says is brand new. Since then they actually tracked me down and cared about what I had to say. According to them they are rewriting the instructions, not shipping with the funny dust caps, and considering additional parts to make the installation go smoother. I was impressed because in this day and age few companies actually seem to care about what their customers really think. I have come to the conclusion that this company does. And the filter system is now working fine, so don't hesitate to buy. I'm leaving my review below in case it takes a while to update the instructions. It might shave a few hours off someones install time. Changed to 5 stars. If you have any problems they will definitely help, and that is a really good thing. ================================================================ Just finished the installation. I'm a pretty handy monkey, but the installation took about 5 hours of my time (including 3 trips to the home improvement store and a some-what helpful phone call to ispring). First-off the manual is misleading and clearly written for another product or previous version of this product (or maybe a new-fangled sausage making machine). The parts of the manual that do apply to this product, like how to connect the little push-on connectors, suffer from an excess of brevity and lack of detail and conciseness. In an attempt to be helpful to future purchasers of this product, at least until ispring updates these kits and instructions, here's what I learned: First tip: the faucet included in my box does not require a 1/2 inch hole, as the instructions state, but a one inch hole. Actually one inch is too tight, make sure you have a 1 1/8 inch hole saw attachment for your drill, and make it a good bi-metal one if you need to cut through a stainless steel sink. Home depot sells rigid brand bits that suit this purpose. It will run you about $15 unless you already have a rigid brand bit shaft (or equivalent). Second tip: the faucet that came with my filter has three colored plastic hoses already permanently attached. Red, white and blue (I dig the patriotism). Unfortunately which gets attached where is not mentioned anywhere in the manual. In the manual it says to screw the water hose to the bottom of the faucet. Clearly referring to a different type of faucet. Also if the three hoses were just a little longer you would probably not need to bother adding extension hose (an extra leak risk). More on extension hoses later. The colors are mentioned in the Amazon description, way at the bottom, but it bears repeating. "Connect the BLUE tubing of 3-color tubings on the faucet to cold water line, RED to the 1st stage on the right, WHITE to the 3rd stage on the left." Note: This is #ssbackward if you are from an English speaking country ... just saying. Third tip: The filter box itself has funny little horn or funnel shaped things on the ends of the inlet (left) and output (right) angle connectors. These are not mentioned at all in the manual. You can not push the hoses on with these in place (you can try as I did ... if you get excited by frustration) because these are some weird sort of dust plugs. You must pull up with your fingernail on the very outer ring of the connector (pushing it on a spring ever so slightly towards the more bulbous part) then with other hand pull the horn thing out. You can discard these, or I found they make nice hats for very small garden gnomes. Basically you can connect the red and white hoses now by pushing them with force into the connector until they snap. Pull back a little to make sure it is connected. If you need to cut extension hose cut it straight, and use the supplied double-sided connectors. I recommend you push the little blue horseshoe shaped clips (supplied) between that outer part of the connector and the more bulbous part. These (I think?) are to make sure the connectors can't shoot apart from water pressure. No mention in manual about these. You can leave them off, as I did at first, if the under side of your sink needs a good spraying out. Fourth tip: In order to connect the blue hose to the cold water line you need to first install some parts. My sink had a 3/8 inch stainless steel hose with female compression fitting attached to a male 3/8 compression fitting shutoff valve coming out of the wall. Pretty typical I would assume. The kit comes with a 1/2 inch plumbing style thread, male to female connector, with a hole to thread the valve the blue hose goes onto, in the middle. A way to tap into your cold water line, would be eazy peezy if it was threaded for 3/8 compression fittings, but it's half inch and has coarser plumbing style threads. So off to the Home Depot you go. Don't forget another roll of Teflon tape to add to your Teflon tape collection while you are there. Actually the folks at the Home Depot weren't that helpful (surprised?), but the small local hardware store in my old town was. You will need, as it turns out (if your sink is like mine) a 1/2 inch plumbing style male to 3/8 inch compression male adapter to connect your current hose leading to your cold faucet to this new part (btw thread the little supplied valve the kit came with into this part with a little teflon tape first so you can get it good and tight before you are lying on your back under the sink). Then on the other end you will need another short stainless hose (only way I can find to do this with available parts ... why it took three trips) 1/2 inch plumbing female, which attaches to other end of this new part, 3/8 compression female which connects to the part your faucet hose used to be connected to. These parts should run less than $15. Tip five : To connect the blue hose to the metal valve from the previous section you need to put it against the nipple, screw off the nut collar and slide it down the hose temporarily, then push it on the nipple all the way, and man it's a tight little bugger (I sprayed the nipple with a little Pam cooking spray, hey it was in the kitchen), then put that nut collar back on and tighten it down real tight with a half inch wrench. Why these filters don't come with a 3/8 inch compression fittings on each side of the filter box, so you can just screw your standard hoses on that you can get from any hardware store, is beyond me. There must be a reason. Maybe these filters are designed by the same folks who design those charming "blister packs" that you need a chainsaw to open? When I tested the water it was cloudy and tasted a little funny, it got better after I ran the tap for a while. Now it tastes pretty darn good. Even my cat likes it. Hopefully it will not develop leaks.

### ⭐⭐⭐⭐⭐ High Quality Tank
*by C***Z on July 14, 2026*

Very easy to install and it's an easy replacement for the tank that wore out. Once installed, water pressure is very high, and we now have a strong stream running from the faucet. Also went through the easy process to register the tank for the warranty. No issues and I was guided through the process by a representative named Robert. iSpring products are great and I highly recommend them.

### ⭐⭐⭐⭐⭐ Top class customer service! Solid quality product!
*by S***Y on November 20, 2013*

Install was a bit tricky, it took two hours, mostly figuring out how to do it, not the work itself. Once we figured it out, it took hands down 15 min! We were lucky and our cold water was already separated into two since I was putting the filter in the place where I had hot water faucet. Water tastes so much better than the tap - you can really taste the difference! (Totally worth the trouble of the install! :) Arrived promptly, packaged securely in the box, but as other people claimed the instructions are a bit unclear for a not so handy monkey as me when it comes to plumbing. I think it might be too technical and sometimes vague. Since I am still somewhat handy, I could deduct from the images in the instructions that somehow one tiny tube stopper part was missing from the package. Well, what is a gall to do? I contacted the company's sell department though their website (123filter), and did receive a prompt response the next day. The whole issue of missing little fitting got promptly resolved free of charge, and even got a USPS tracking provided! Now, if that is not exceptional customer service - I don't know what is! The product itself feels sturdy; nothing feels cheap about this system. I must say that I love the faucet included! Oh! It is beautiful! Some of these faucets for these type of undersink systems are sold by other companies for 80 bucks, and it looks nowhere near what this faucet looks like! This looks like Neiman Marcus compared to Macy/ Target! The price for this system is fair - I don't think anyone is fleecing you with this product on quantity or quality, and you are not fleecing anyone either. What is a great deal are the replacement filters for a year go for about 80-90 bucks, which I think is also really good compared to other systems. I hardly use my GE fridge water filter and basically pay around that much for that filter for a year. AND if you have some issue with installation (one-time time investment) - contact iSpring - they got your back! :) I picked this filter on the day I decided that my new condo needed a undersink filtration filter. I already knew quite a lot about filters so I was not a novice in that regard. I knew what a good filtration system should filter and cost. If you are looking for a system right now, please make sure you look at good quality filters based on what is actually being filtered (filter type), original cost, and then also take into account filter replacement cost. I bought this filter system based on these criteria. Choosing a right filtration system is quite a pain, especially for under the sink products. It can takes a good month of research, comparison of products, and then finally price hunting. In the process one learns enough about water germs and contaminates to start believing that nothing short of atomically decomposing the water will purify it enough! I went though this before with another system, and didn't want to obsess about percentages of stuff that gets filtered that I did not even know existed prior to the clean water quest I now realize choosing a water filtration system really is! Brita was one of my first water filtration system that I had attached to my faucet after I had DC water authorities test my DC water in my fancy Dupont Circe apartment. I learned that my cold water had enough chlorine in it as recommend for a pool. That was ten years ago. Since I came to DC from Sweden, I must confess that I was at the time absolutely ignorant of the fact that faucet water could be harmful. So I started with Brita carbon filters, which followed other over the sink and under the sink water filters. Since then, I have solid quality filters everywhere, and I don't live in DC anymore! If you think chlorine is no big deal - try drinking pool water for three years and see how your insides feel. SIDENOTE: There are quite a few parts in the package; I do think it would be helpful if the company included pictures of all parts that should be in the package and how they fit together because most of them I wouldn't even know what to call. A youtube video as for the osmosis product did help a bit, and I think if there would be one for this product as well, since not all clean-water enthusiast are osmosis converts, that would resolve the whole installation issue completely!

## Frequently Bought Together

- 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
- iSpring ICEK Ultra Safe Fridge Water Line Connection and Ice Maker Installation Kit for Reverse Osmosis RO Systems & Water Filters, 1/4", 20 feet
- iSpring APR40 Pressure Regulator Filter Protection Valve with 1/4" Quick Connect, 40 psi

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*Product available on Desertcart Greece*
*Store origin: GR*
*Last updated: 2026-08-29*