---
product_id: 228655363
title: "FG25B-KS"
brand: "ispring"
price: "€ 225.51"
currency: EUR
in_stock: null
reviews_count: 13
category: "I Spring"
url: https://www.desertcart.de/products/228655363-fg25b-ks
store_origin: DE
region: Germany
---

# Up to 150K gallons lifespan Standard 20" x 4.5" fit Heavy metal & chlorine defense FG25B-KS

**Brand:** ispring
**Price:** € 225.51
**Availability:** ❌ Out of Stock

## Summary

> 💧 Elevate your home’s water game—because your family deserves nothing less!

## Quick Answers

- **What is this?** FG25B-KS by ispring
- **How much does it cost?** € 225.51 with free shipping
- **Is it available?** Currently out of stock
- **Where can I buy it?** [www.desertcart.de](https://www.desertcart.de/products/228655363-fg25b-ks)

## 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

- • **Seamless Compatibility:** Fits all standard 20" x 4.5" whole house filter housings for effortless replacement and upgrade.
- • **Dedicated Customer Care:** Expert support from Atlanta-based team ensures smooth installation and hassle-free filter replacements.
- • **Long-Lasting Performance:** Filters up to 150,000 gallons or 10-12 months, minimizing maintenance and maximizing peace of mind.
- • **Mineral-Friendly Filtration:** Keeps essential healthy minerals while eliminating harmful chemicals—balance your water, not strip it.
- • **Ultimate Contaminant Shield:** Removes chlorine, lead, mercury, pesticides & odors for pure, safe water throughout your home.

## Overview

The iSpring FG25B-KS is a premium 20" x 4.5" whole house replacement filter cartridge combining GAC and KDF media to effectively reduce chlorine, heavy metals, pesticides, and odors. Designed for standard housings, it delivers up to 150,000 gallons of contaminant-free water while preserving beneficial minerals. Backed by NSF certification and responsive customer service, it’s the smart upgrade for healthier water and appliance protection.

## Description

The FG25B-KS 20” x 4.5” compound filter is the official 2nd stage replacement filter cartridge for iSpring WGB32B-KS Whole House Water Filtration System. It also fits standard 20" whole house water filters. This filter is made of quality GAC and KDF and is designed to remove chlorine, lead, mercury, hydrogen sulfide, heavy metals, pesticides, herbicides, odors, and other contaminants. FG25B-KS works in tandem with carbon filters (FC25B) and sediment filters (FP25B) to create a reliable shield that protects you and your family from ingesting harmful chemicals and contaminants no matter which part of your home you are getting your water in.

Review: Excellent product and amazing customer service! - I couldn't be happier with my experience with iSpring Filters. The product itself is excellent -high quality, well-built, and performs exactly as advertised. What really stood out, though, was the customer service. I had an issue with a filter that malfunctioned, and Nick from iSpring went above and beyond to help. He was responsive, professional, and immediately sent replacement filters without any hassle. That level of support is rare these days and truly appreciated. It's clear that iSpring stands behind their products and genuinely cares about their customers. Thanks again to Nick for making the process smooth and stress-free. I highly recommend iSpring Filters to anyone looking for reliable water filtration and top- tier customer service.
Review: Outstanding service and product - I purchased an iSpring wall mounted three stage (canister) whole house water filtration system several years ago to replace a dual tank floor mounted system that took up too much room and did not back flush properly and could not deliver quality water results. The iSpring system takes up very little wall space and maintenance is easy, simply changing the three filters yearly based on our water usage. Customer service was great with Nick giving me sound advice regarding installation. A couple of years later he gave me good advice as to the use a heat gun to loosen tanks when I had overtightened two canisters. I recently learned that Nick is still providing customer service when I had a question regarding an order for replacement filters. We are serviced by a small water utility company which has pure water, but the water has high levels of sand and sometimes high levels of chlorine. The 5-micron sediment filter removes most of the sand and two CTO carbon block filters do a great job removing chlorine and any remaining sand. We do experience water line breakage occasionally which can introduce large amounts of sediment into the lines which is a health hazard and can damage water heaters, dish washers, and washing machines leading to premature failure. This is another reason to install a whole house system instead of point of source filters for sinks and lavatories. I do find the iSpring replacement filters high quality and reasonably priced particularly when purchased in cases of four like my recent order. Merlin

## Features

- [Protect Your Family and Household Appliance from Chlorine, Heavy Metal, and Other Harmful Chemicals] FG25B-KS 20” x 4.5” compound filter is designed to remove chlorine, lead, mercury, hydrogen sulfide, heavy metals, pesticides, herbicides, odors, and other contaminants.
- [Standard Size] Our filter set fits any standard whole house water filter housings that require 20” x 4.5” cartridges. Each cartridge is individually wrapped to ensure that the filter stays fresh. Please unwrap the cartridges before installation.
- [Built to Last] Your filter changing schedule will be based on the contamination level of your source water. We recommend changing your filters every 10-12 months or when you’ve filtered up to 150K gallons of water. Our filter cartridges are hassle-free and replacement is a breeze!
- [Peace-of-Mind Customer Service] We offer both technical assistance and customer service support by phone or email out of our headquarters in Atlanta, GA. Our knowledgeable team is available to help you find a filtration solution that best solves your specific water concerns or to help with any after-sale support you may need. Our goal is, and always will be, to maximize your user experience.
- [Please Note] Unlike an RO membrane, this filter DOES NOT reduce Total Dissolved Solids (TDS). Instead this filter keeps healthy minerals in your water while removing harmful chemicals. If you are interested in a filter that removes TDS, consider our iSpring Reverse Osmosis (RO) systems.

## Technical Specifications

| Specification | Value |
|---------------|-------|
| ASIN | B08HPKCZ33 |
| Best Sellers Rank | #8,316 in Tools & Home Improvement ( See Top 100 in Tools & Home Improvement ) #165 in Replacement Under-Sink Water Filters |
| Brand | iSpring |
| Compatible Water Purifier Models | iSpring WGB32B |
| Customer Reviews | 4.6 4.6 out of 5 stars (1,376) |
| Date First Available | September 8, 2020 |
| External Testing Certification | NSF |
| Item Weight | 5 pounds |
| Item model number | FG25B-KS |
| Manufacturer | iSpring Water Systems |
| Material | Metal |
| Number of Items | 1 |
| Product Benefits | Reduces chlorine, heavy metals, etc |
| Product Dimensions | 4.5"D x 4.5"W x 20"H |
| Set Name | Standard 20” x 4.5” Whole House Water Filter Cartridge |
| UPC | 810004172128 |
| Unit Count | 1 Count |

## Product Details

- **External Testing Certification:** NSF
- **Item Weight:** 5 Pounds
- **Material:** Metal
- **Product Benefits:** Reduces chlorine, heavy metals, etc
- **Product Dimensions:** 4.5"D x 4.5"W x 20"H

## Images

![FG25B-KS - Image 1](https://m.media-amazon.com/images/I/61vS4ORIJzL.jpg)

## Available Options

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

## Customer Reviews

### ⭐⭐⭐⭐⭐ Excellent product and amazing customer service!
*by W***I on January 6, 2026*

I couldn't be happier with my experience with iSpring Filters. The product itself is excellent -high quality, well-built, and performs exactly as advertised. What really stood out, though, was the customer service. I had an issue with a filter that malfunctioned, and Nick from iSpring went above and beyond to help. He was responsive, professional, and immediately sent replacement filters without any hassle. That level of support is rare these days and truly appreciated. It's clear that iSpring stands behind their products and genuinely cares about their customers. Thanks again to Nick for making the process smooth and stress-free. I highly recommend iSpring Filters to anyone looking for reliable water filtration and top- tier customer service.

### ⭐⭐⭐⭐⭐ Outstanding service and product
*by A***R on January 7, 2025*

I purchased an iSpring wall mounted three stage (canister) whole house water filtration system several years ago to replace a dual tank floor mounted system that took up too much room and did not back flush properly and could not deliver quality water results. The iSpring system takes up very little wall space and maintenance is easy, simply changing the three filters yearly based on our water usage. Customer service was great with Nick giving me sound advice regarding installation. A couple of years later he gave me good advice as to the use a heat gun to loosen tanks when I had overtightened two canisters. I recently learned that Nick is still providing customer service when I had a question regarding an order for replacement filters. We are serviced by a small water utility company which has pure water, but the water has high levels of sand and sometimes high levels of chlorine. The 5-micron sediment filter removes most of the sand and two CTO carbon block filters do a great job removing chlorine and any remaining sand. We do experience water line breakage occasionally which can introduce large amounts of sediment into the lines which is a health hazard and can damage water heaters, dish washers, and washing machines leading to premature failure. This is another reason to install a whole house system instead of point of source filters for sinks and lavatories. I do find the iSpring replacement filters high quality and reasonably priced particularly when purchased in cases of four like my recent order. Merlin

### ⭐⭐⭐⭐⭐ Great product
*by G***N on January 22, 2026*

great filters for the price.

## Frequently Bought Together

- iSpring FG25B-KS High Capacity Heavy Metal Reducing GAC and KDF Whole House Water Filter Replacement Cartridge, 4.5” x 20”
- Captain O-Ring – Replacement ORBX2 O-Rings for iSpring WGB22B, WGB32B Series Whole House Water Filter (4 Pack)
- iSpring WSP-1000 Reusable Whole House Spin Down Sediment Water Filter, 1000 Micron, Flushable Prefilter Filtration, 20GPM, 1" MNPT + 3/4" FNPT, Brass

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---

*Product available on Desertcart Germany*
*Store origin: DE*
*Last updated: 2026-03-10*