---
product_id: 70445757
title: "FC15B High Capacity Activated CTO Carbon Block Filter for Under Sink and Whole House Water Filtration System, 5-Micron 10\"x4.5\""
brand: "ispring"
price: "€ 103.13"
currency: EUR
in_stock: true
reviews_count: 8
category: "I Spring"
url: https://www.desertcart.es/products/70445757-fc15b-high-capacity-activated-cto-carbon-block-filter-for-under
store_origin: ES
region: Spain
---

# Premium coconut shell activated carbon Filters up to 50,000 gallons 10" x 4.5" standard size FC15B High Capacity Activated CTO Carbon Block Filter for Under Sink and Whole House Water Filtration System, 5-Micron 10"x4.5"

**Brand:** ispring
**Price:** € 103.13
**Availability:** ✅ In Stock

## Summary

> 💧 Elevate your water game—because your home deserves the freshest flow!

## Quick Answers

- **What is this?** FC15B High Capacity Activated CTO Carbon Block Filter for Under Sink and Whole House Water Filtration System, 5-Micron 10"x4.5" by ispring
- **How much does it cost?** € 103.13 with free shipping
- **Is it available?** Yes, in stock and ready to ship
- **Where can I buy it?** [www.desertcart.es](https://www.desertcart.es/products/70445757-fc15b-high-capacity-activated-cto-carbon-block-filter-for-under)

## 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

- • **Eco-Friendly & Safe:** Crafted without binders or adhesives—no carbon ash leaching, just pure filtration power.
- • **Ultra-Pure Hydration:** Removes 99% chlorine, odors & harmful organics for crisp, clean water at every tap.
- • **Risk-Free Refreshment:** Backed by 30-day money-back guarantee and lifetime tech support from iSpring experts.
- • **Seamless Compatibility:** Fits iSpring US21B & whole house systems plus any standard 10" x 4.5" filter housing.
- • **Long-Lasting Performance:** Filters up to 50,000 gallons or 6 months—less hassle, more refreshment.

## Overview

The iSpring FC15B is a high-capacity 5-micron activated carbon block filter designed for under sink and whole house water filtration systems. Made from premium coconut shell carbon, it effectively removes chlorine, taste, odor, and harmful organic compounds, delivering up to 50,000 gallons of clean water. Compatible with iSpring US21B and whole house models, it ensures long-lasting, eco-friendly filtration with easy installation and reliable customer support.

## Description

Used as the second stage for iSpring Direct Connect under sink water filter system US21B and iSpring whole house filtration system WGB21B or the first stage of iSpring whole house filtration systems WGB21BM and WGB21B-PB. The carbon block filter consists of high-quality activated carbon. It is effective in reducing free chlorine, bad taste, odor, THM, organics, hazardous chemicals, and more. Depending on source water quality or flow rate, it needs to be replaced every 6 months or about 50, 000 gallons of water. Each filter is individually sealed to keep freshness. Fits models using standard 10" x 4.5" water filters.

Review: Highly Recommended if You Have a Questionable Water Supply - Like most people, we purchased this to clean up our local water. We live in a water district that gets it's water from a series of wells. It's mostly acceptable water, but every once and a while we would see a noticeable color change in the water for a day or two - a yellowish tint. The water district said there was no issue, but we were concerned what quality of water we were actually getting. We also have an on demand hot water heater. They are more prone to develop scale from poor water supply. The filter system installation was straightforward and easy. It is bigger than you might imagine, so measure to make sure that you'll have the wall space required. We immediately noticed a difference in our water quality. The clarity of the water in our bath was noticeable. It almost felt like we had installed a water softener. The replacement filters are easy to replace. Watch for them on sale to save yourself a few dollars. High quality and a noticeable difference!
Review: Best 2-stage filter I found! Great for well-water! - Installed in a new house "to us" that is on a well that was drilled in the 1960's. We had bad issues with rust and iron tasting water. The 2 stage did the trick and works very well! The flow is reversible, so you can customize input/output as needed (we swapped the labels). Easy to use! Words of advice: you only need to tighten the containers 1/4 turn past hand-tight, to extend life of filter, you can remove and wash them out, use iSpring filters (I tried others and the pressure drop was horrendous).

## Features

- [Premium Quality Material] Using high-quality coconut shell carbon and highly compact fabrication tech, this highly activated carbon block CTO(Chlorine, Taste, and Odor) filter cartridge is designed and produced to achieve maximum filtration efficiency and filter life for 10" Under Sink Water Filter and Whole House Water Filtration Systems. Free of surfactants, binders, and adhesives. No leaching carbon ash
- [Exceptional Filtration Performance] Knocks out cloudiness as well as bad tastes and odors, removes up to 99% of chlorine, and is highly effective on Organic Compounds like herbicides, and industrial solvents and other contaminants like trihalomethanes. Steady flow and high absorption
- [Long Filter Life] Filters up to 50,000 gallons depending on the use and feed water quality. Replace the filter every 6 months or every 50,000 gallons of water for optimal performance. Usually used as the second stage filter for whole house water filtration systems, FC15B brings clean and refreshing water to every faucet in your home
- [Great Compatibility] Official replacement filter for iSpring Under Sink Water Filter System US21B and Whole House water filtration systems(WGB21B, WGB21BM, and WGB21B-PB). Fits other standard 10" x 4.5" undersink and whole house water filtration systems. Individually sealed for freshness
- [Peace-of-mind Customer Support] Your risk-free shopping experience is backed by a 30-day money-back guarantee and lifetime tech support from iSpring in Alpharetta, GA

## Technical Specifications

| Specification | Value |
|---------------|-------|
| Brand | iSpring |
| Capacity | 50000 Gallons |
| Included Components | 1 FC15B CTO Filter |
| Installation Type | Under Sink |
| Material | Carbon Block |
| Special Feature | UV Light Disinfection |

## Product Details

- **Brand:** iSpring
- **Model Name:** FC15B High Capacity Activated CTO Carbon Block Water Filter
- **UPC:** 662425080212
- **Global Trade Identification Number:** 00662425080212
- **Manufacturer:** iSpring Water Systems

## Images

![FC15B High Capacity Activated CTO Carbon Block Filter for Under Sink and Whole House Water Filtration System, 5-Micron 10"x4.5" - Image 1](https://m.media-amazon.com/images/I/51pZt-gNNAL.jpg)

## Available Options

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

## Questions & Answers

**Q: Using ispring dual stage set up. would 2 of these filters work best to remove chlorine from municipal water? the water is clean but chemical laden.**
A: Thanks for your interest in the iSpring whole-house water filter. Knocks out cloudiness as well as bad tastes and odors remove up to 99% of chlorine, and is effective on herbicides and industrial solvents, and other contaminants like trihalomethanes. Steady flow and high absorption.
Filters up to 50,000 gallons depending on the use and feed water quality. Replace the filter every 6 months or every 50,000 gallons of water for ideal performance, depending on the quality of source water and daily water consumption. If you have other questions, please call us at 678-261-7611 (M-F, 8:30 - 5:30 EST), text us at 470-560-0012 (M-F, 8:30 - 5:30 EST), or email us at support@123filter.com. We are happy to help.

**Q: Do you have to rinse/flush the carbon filter before installing it in the whole house system? If yes, what’s the way to do so? Thank you**
A: Hi TC, You can flush the filter after installation. Just open the nearest tap and let it run until the water is clear or when all the carbon residue is out. Please reach out to our customer service team for additional questions. We're always ready to help.

iSpring Water Systems, LLC

**Q: How Big Is It?**
A: Thank you for your question! The size of the filter is 4.5 inch (diameter) x 10 inch (length).

Best,
iSpring Water Systems LLC

**Q: is there a catalyitic carbon filter avaiable to remove chloramines?**
A: Chloramine is removed from water with essentially the same strategies that are used to remove chlorine. This means that carbon filtration is the best removal method and filter carbon does indeed remove chloramine. The problem is that it takes more carbon and more contact time to do the job. In practical terms this means that if your City disinfects your tap water with chloramines you'll need to get a larger and better carbon filter than you would need if chlorine alone were used. All our products use activated carbon so are capable of removing chloramine.

## Customer Reviews

### ⭐⭐⭐⭐⭐ Highly Recommended if You Have a Questionable Water Supply
*by D***N on January 3, 2026*

Like most people, we purchased this to clean up our local water. We live in a water district that gets it's water from a series of wells. It's mostly acceptable water, but every once and a while we would see a noticeable color change in the water for a day or two - a yellowish tint. The water district said there was no issue, but we were concerned what quality of water we were actually getting. We also have an on demand hot water heater. They are more prone to develop scale from poor water supply. The filter system installation was straightforward and easy. It is bigger than you might imagine, so measure to make sure that you'll have the wall space required. We immediately noticed a difference in our water quality. The clarity of the water in our bath was noticeable. It almost felt like we had installed a water softener. The replacement filters are easy to replace. Watch for them on sale to save yourself a few dollars. High quality and a noticeable difference!

### ⭐⭐⭐⭐⭐ Best 2-stage filter I found! Great for well-water!
*by T***Y on January 12, 2026*

Installed in a new house "to us" that is on a well that was drilled in the 1960's. We had bad issues with rust and iron tasting water. The 2 stage did the trick and works very well! The flow is reversible, so you can customize input/output as needed (we swapped the labels). Easy to use! Words of advice: you only need to tighten the containers 1/4 turn past hand-tight, to extend life of filter, you can remove and wash them out, use iSpring filters (I tried others and the pressure drop was horrendous).

### ⭐⭐⭐⭐⭐ Great system and Great Costumer Service
*by P***R on November 2, 2025*

The installation of the filter was a relatively simple process. The water quality improved dramatically, boasting remarkable clarity, a pleasant taste, and no discernible odor. Nevertheless, it became necessary to acquire a new set of filters, as the water flow began to decrease, prompting consideration of replacing the water tank. It is also worth noting that the customer service team was highly attentive and knowledgeable, with Nick providing exceptional assistance, including the registration of the system and the supply of new filters.

## Frequently Bought Together

- iSpring FC15B High Capacity Activated CTO Carbon Block Filter Replacement Cartridge for Under Sink and Whole House Water Filtration System, 5-Micron 10"x4.5"
- iSpring FP15B Sediment Filter Replacement Cartridge for Whole House Water Filtration Systems, High Capacity 5-Micron Premium PP, 4.5" x 10", White
- iSpring WGB21B 2-Stage Whole House Water Filtration System, with 10" x 4.5" Sediment CTO(Chlorine, Taste, and Odor) Filter, 1" Inlet/Outlet

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*Product available on Desertcart Spain*
*Store origin: ES*
*Last updated: 2026-03-15*