---
product_id: 35285952
title: "iSpring Greatwell Reverse Osmosis Membrane 100 GPD 11.75” X 1.75”, Replacement Fits Standard Under Sink RO Drinking Water Filtration System, MC1"
brand: "ispring"
price: "€ 55.13"
currency: EUR
in_stock: true
reviews_count: 11
category: "I Spring"
url: https://www.desertcart.ie/products/35285952-ispring-greatwell-reverse-osmosis-membrane-100-gpd-11-75-x
store_origin: IE
region: Ireland
---

# 100 GPD capacity 0.0001 micron filtration NSF/ANSI certified iSpring Greatwell Reverse Osmosis Membrane 100 GPD 11.75” X 1.75”, Replacement Fits Standard Under Sink RO Drinking Water Filtration System, MC1

**Brand:** ispring
**Price:** € 55.13
**Availability:** ✅ In Stock

## Summary

> 💧 Elevate your water game with the membrane that means business.

## Quick Answers

- **What is this?** iSpring Greatwell Reverse Osmosis Membrane 100 GPD 11.75” X 1.75”, Replacement Fits Standard Under Sink RO Drinking Water Filtration System, MC1 by ispring
- **How much does it cost?** € 55.13 with free shipping
- **Is it available?** Yes, in stock and ready to ship
- **Where can I buy it?** [www.desertcart.ie](https://www.desertcart.ie/products/35285952-ispring-greatwell-reverse-osmosis-membrane-100-gpd-11-75-x)

## 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

- • **Fits Like a Glove:** Standard 11.75” x 1.75” size fits most under-sink RO systems for seamless replacement.
- • **Ultra-Pure Hydration:** Removes 99%+ of 1,000+ contaminants including lead, chlorine & fluoride for crystal-clear water.
- • **Reliable Daily Output:** Delivers up to 100 gallons per day, keeping your household hydrated without compromise.
- • **Peace of Mind Warranty:** Register for lifetime free tech support and manufacturer warranty—support that never quits.
- • **Precision Filtration Tech:** 0.0001 micron membrane ensures only water molecules pass through—nothing else gets in.

## Overview

The iSpring Greatwell Reverse Osmosis Membrane MC1 is a high-capacity, NSF-certified filtration cartridge designed to fit standard under-sink RO systems. With a microscopic 0.0001 micron pore size, it removes over 99% of contaminants including lead, chlorine, and fluoride, delivering up to 100 gallons of purified water daily. Engineered for easy replacement and backed by lifetime tech support, it’s the trusted choice for millennial professionals demanding clean, safe hydration at home.

## Description

desertcart.com: iSpring Greatwell Reverse Osmosis Membrane 100 GPD 11.75” X 1.75”, Replacement Fits Standard Under Sink RO Drinking Water Filtration System, MC1

Review: Great product. clear instructions. - This under sink 5 stage RO system went together easily with the help of the manual and is currently working quite well. A number of little things, like the spare parts kit and the leak sensor cutoff switch are a nice touch. The first stage sediment filter clear housing is a must and seems to only be included in this brand. Overall quality is excellent and the full color pictures with little installation hints were great. Some minor howevers... However, there are a couple of items that can be improved, although they don't directly affect the performance of the system. One is the sheer bulk of the system (and any other RO system of this design). For dual sink installations where you have two sets of drains - and possibly garbage disposers, the system will not fit under the sink in all cases - mine was one. The main problem is the pressure tank. If you have a cabinet next door to the sink that you can give up some space, then the tank can go there. Otherwise it could be a deal breaker. This should be explained at the beginning of the manual and should give a footprint diagram and state: "STOP! Before you unpack our system...". This could simply be an added sheet laying in the top of the package. Second, the tool list is basic and you'll need other tools depending on the installation. Buy the optional slide-out rack is a must unless you plan to unmount the entire RO system occasionally as it will be impossible to change filters under the sink, especially the RO membrane. I ended up installing mine in the utility room with the faucet mounted on my laundry sink. This would be true of any RO system of this design. Not something explained on desertcart web pages for any system I looked at. Third, the manual gives a great description on how to prepare the leak sensor feedwater cutoff device, but they omitted to tell you where to put it and which line to put it in. I added the term "feedwater" because that's the line you put it in. It should be placed in the bottom of the sink cabinet under the RO system to detect leaks from the various push-in connectors that wet the cabinet floor. That should be thoroughly explained and seems to have been missed. Fourth, this system on my pressure well pump with 50-65 psi pressure switch, produces about 20 gallons a day, not 75 as advertised on desertcart. Real specs are actually spelled out in the manual and are accurate there. Not sure why they are advertising 75 GPD. The RO water to waste water ratio is not 1.5:1, which sounds amazing. It is closer to 1:1.5, which is closer to what I have read, about RO systems and is actually quite good for a non-boosted system. Although this is what I expected, it is something to be aware of if you are using it heavily and are paying for your water. A note on the above performance: my TDS (total dissolved solids) is lab tested at about 280 ppm for calcium compounds. This is high, resulting in very hard water, and will slow down RO water production. Also, running the system on a constant regulated higher pressure of 65 psi will improve the RO ratio and production performance. If you're not sure the RO system is working, without a TDS meter, just taste the waste water. (be careful if you suspect high levels of contaminants). Mine tastes like you dissolved a stick of chalk in it - imagined. The RO water is refreshing and clean. Overall, the system is excellent. The USA based company is one reason I chose this system. Although I have not had to use their help, other reviewers did and got good service. I highly recommend this system and their USA based company iSpring.
Review: Exact filter to replace old system - Quality replacement for the iSpring RO water filter. Easy to install and the water quality is great.

## Features

- Enjoy Your Water with Confidence: Our Reverse Osmosis membrane is able to remove up to 99% of over 1,000 contaminants from your water, including lead (removes up to 98% of lead), chlorine, fluoride, arsenic, asbestos, calcium, sodium and more.
- Top-notch Quality - Tested by independent third-party to meet NSF/ANSI Standards, our Reverse Osmosis Membrane is made of food-grade high capacity material that provides high packing density to remove contaminants. With the 0.0001 micron size, it only allows water molecules to squeeze through and virtually nothing else. TDS rejection rate up to 97% (under NSF58 testing condition).
- Standard Size - With 11.75" X 1.75" industry-standard size, our membrane fits most standard under sink RO membrane housings. It has the capability of producing 75 gallons of water per day, ensuring that families of nearly any size will have plenty of clean drinking water available on demand.
- Peace of Mind Customer Service - Register online to activate your manufacturer warranty and life-time free tech support. We stand behind our products and if you encounter any problems with any of our products please reach out to us immediately. We are happy to help!
- Please note - The membrane normally lasts about 2-3 years depending on your source water quality. If your water is very hard (Total Dissolved Solids level above 750 ppm), please contact us for customized solutions.

## Technical Specifications

| Specification | Value |
|---------------|-------|
| ASIN | B007TB9NEC |
| Batteries Included? | No |
| Batteries Required? | No |
| Best Sellers Rank | #4,970 in Tools & Home Improvement ( See Top 100 in Tools & Home Improvement ) #85 in Replacement Water Filters |
| Brand | iSpring |
| Color | Blue |
| Customer Reviews | 4.7 4.7 out of 5 stars (5,151) |
| Date First Available | April 11, 2012 |
| External Testing Certification | NSF |
| Global Trade Identification Number | 00662425048113 |
| Included Components | RO membrane |
| Is Discontinued By Manufacturer | No |
| Item Package Quantity | 1 |
| Item Weight | 7.4 ounces |
| Item model number | MC |
| Manufacturer | iSpring |
| Material | Aromatic Polyamide, Cellulose Acetate, Thin Film Composite Membrane |
| Number Of Pieces | 1 |
| Number of Items | 1 |
| Part Number | MC1 |
| Product Benefits | Removes up to 99% of over 1,000 contaminants from water, including lead, chlorine, fluoride, arsenic, asbestos, calcium, sodium, and more. |
| Product Dimensions | 1.7"D x 1.7"W x 11.75"H |
| Size | 1 Count (Pack of 1) |
| Style | 100 GPD |
| UPC | 662425048113 |
| Unit Count | 1.0 Count |

## Product Details

- **External Testing Certification:** NSF
- **Item Weight:** 7.4 Ounces
- **Material:** Aromatic Polyamide, Cellulose Acetate, Thin Film Composite Membrane
- **Product Dimensions:** 1.7"D x 1.7"W x 11.75"H

## Images

![iSpring Greatwell Reverse Osmosis Membrane 100 GPD 11.75” X 1.75”, Replacement Fits Standard Under Sink RO Drinking Water Filtration System, MC1 - Image 1](https://m.media-amazon.com/images/I/61l4CyFt48L.jpg)

## Customer Reviews

### ⭐⭐⭐⭐⭐ Great product. clear instructions.
*by R***0 on April 20, 2025*

This under sink 5 stage RO system went together easily with the help of the manual and is currently working quite well. A number of little things, like the spare parts kit and the leak sensor cutoff switch are a nice touch. The first stage sediment filter clear housing is a must and seems to only be included in this brand. Overall quality is excellent and the full color pictures with little installation hints were great. Some minor howevers... However, there are a couple of items that can be improved, although they don't directly affect the performance of the system. One is the sheer bulk of the system (and any other RO system of this design). For dual sink installations where you have two sets of drains - and possibly garbage disposers, the system will not fit under the sink in all cases - mine was one. The main problem is the pressure tank. If you have a cabinet next door to the sink that you can give up some space, then the tank can go there. Otherwise it could be a deal breaker. This should be explained at the beginning of the manual and should give a footprint diagram and state: "STOP! Before you unpack our system...". This could simply be an added sheet laying in the top of the package. Second, the tool list is basic and you'll need other tools depending on the installation. Buy the optional slide-out rack is a must unless you plan to unmount the entire RO system occasionally as it will be impossible to change filters under the sink, especially the RO membrane. I ended up installing mine in the utility room with the faucet mounted on my laundry sink. This would be true of any RO system of this design. Not something explained on Amazon web pages for any system I looked at. Third, the manual gives a great description on how to prepare the leak sensor feedwater cutoff device, but they omitted to tell you where to put it and which line to put it in. I added the term "feedwater" because that's the line you put it in. It should be placed in the bottom of the sink cabinet under the RO system to detect leaks from the various push-in connectors that wet the cabinet floor. That should be thoroughly explained and seems to have been missed. Fourth, this system on my pressure well pump with 50-65 psi pressure switch, produces about 20 gallons a day, not 75 as advertised on Amazon. Real specs are actually spelled out in the manual and are accurate there. Not sure why they are advertising 75 GPD. The RO water to waste water ratio is not 1.5:1, which sounds amazing. It is closer to 1:1.5, which is closer to what I have read, about RO systems and is actually quite good for a non-boosted system. Although this is what I expected, it is something to be aware of if you are using it heavily and are paying for your water. A note on the above performance: my TDS (total dissolved solids) is lab tested at about 280 ppm for calcium compounds. This is high, resulting in very hard water, and will slow down RO water production. Also, running the system on a constant regulated higher pressure of 65 psi will improve the RO ratio and production performance. If you're not sure the RO system is working, without a TDS meter, just taste the waste water. (be careful if you suspect high levels of contaminants). Mine tastes like you dissolved a stick of chalk in it - imagined. The RO water is refreshing and clean. Overall, the system is excellent. The USA based company is one reason I chose this system. Although I have not had to use their help, other reviewers did and got good service. I highly recommend this system and their USA based company iSpring.

### ⭐⭐⭐⭐⭐ Exact filter to replace old system
*by T***2 on December 22, 2025*

Quality replacement for the iSpring RO water filter. Easy to install and the water quality is great.

### ⭐⭐⭐⭐⭐ Great Value.
*by B***B on January 12, 2026*

Work Great. Fit perfect. Excellent PPM levels. We use them in our off-grid setup for drinking. coffee, cooking water. So they last longer than a year. After 1st year PPM was 30. We use the LED UV after these to have 7 stage.

## Frequently Bought Together

- iSpring MC1 1.8-Inch x 12-Inch 100GPD Reverse Osmosis Membrane
- iSpring F9K 1-Year Reverse Osmosis Water Filter Replacement Cartridge Pack Set for 6-Stage Alkaline Mineral RO Filtration Systems, Without Membrane, White

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*Product available on Desertcart Ireland*
*Store origin: IE*
*Last updated: 2026-01-26*