---
product_id: 2632937
title: "F9K NSF Certified 1-Year Reverse Osmosis Water Filter, Alkaline Remineralization Filters for 6-Stage RO Systems, Without RO Membrane"
brand: "ispring"
price: "€ 140.35"
currency: EUR
in_stock: true
reviews_count: 13
category: "I Spring"
url: https://www.desertcart.hr/products/2632937-f9k-nsf-certified-1-year-reverse-osmosis-water-filter-alkaline
store_origin: HR
region: Croatia
---

# pH-balanced alkaline remineralization 1-year filtration lifespan 6-stage multi-filter system F9K NSF Certified 1-Year Reverse Osmosis Water Filter, Alkaline Remineralization Filters for 6-Stage RO Systems, Without RO Membrane

**Brand:** ispring
**Price:** € 140.35
**Availability:** ✅ In Stock

## Summary

> 💧 Elevate your hydration game with iSpring’s 1-year powerhouse filter pack!

## Quick Answers

- **What is this?** F9K NSF Certified 1-Year Reverse Osmosis Water Filter, Alkaline Remineralization Filters for 6-Stage RO Systems, Without RO Membrane by ispring
- **How much does it cost?** € 140.35 with free shipping
- **Is it available?** Yes, in stock and ready to ship
- **Where can I buy it?** [www.desertcart.hr](https://www.desertcart.hr/products/2632937-f9k-nsf-certified-1-year-reverse-osmosis-water-filter-alkaline)

## 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

- • **Effortless Compatibility:** Standard 10” x 2.5” cartridges fit seamlessly into most 6-stage RO systems—upgrade without hassle.
- • **Year-Long Pure Hydration:** Enjoy a full 12 months of crisp, contaminant-free water with 9 premium replacement filters.
- • **Eco-Smart & Cost-Effective:** Ditch bottled water, reduce plastic waste, and save money while savoring superior water quality.
- • **Advanced 6-Stage Filtration:** Sediment, activated carbon, and post-carbon filters work in harmony to deliver crystal-clear water every time.
- • **Alkaline Boost for Wellness:** Restore essential minerals like calcium and magnesium for balanced pH and enhanced taste.

## Overview

The iSpring F9K is a NSF-certified 1-year replacement filter pack designed for 6-stage reverse osmosis systems. It includes 9 individually wrapped cartridges—sediment, granular activated carbon, carbon block, post-carbon, and alkaline remineralization filters—that ensure efficient contaminant removal and restore healthy minerals for pH-balanced, great-tasting water. Compatible with standard 10” x 2.5” housings, this pack offers an easy, renter-friendly upgrade to maintain clean, fresh water while reducing reliance on bottled alternatives.

## Description

Product description Fits Most 10'' Reverse Osmosis Water Filter System F9K RCC7AK F3 F5-75 F19K75

Review: System lasts: Clean water, great taste and feel. Renter friendly price. Nature & we both benefit. - Super system at this price! We've bought it years ago. Of course, the filters fit. We installed the iSpring reverse osmosis set a few years back. It is well worth it's money by now. Water from regular interval filters tastes good to me, and I am sensitive when it comes to water's taste. Can't drink odd or off tastes without cringe. I like arrowhead though not in ecstasy about it, not ok from plastic bottles stored in hot weather except in emergencies. I like some mountain streams and some wood springs, am ok with occasional, light carbonation - though it won't improve the taste, just change and mask it. We also used different $15-30 test strips on occasion throughout the house and this water's our clean baseline. I hate chlorine taste and feel and do not want more iron or lead or PFAS than necessary, either. There's only so much antioxidants can do for us. So, despite the terrible fact that this system wastes 2x the amount of water you get from it (wish we could rig it so the excess watered our garden or plant) - this is totally worth it to me. I try to meditate when filling a bottle to put in the fridge for the day, it takes about 20 seconds. It's not so bad with just a glass, but it also isn't for the super easily annoyed. Our storage canister, which is slowly refilled with pre-filtered water after you tab out some, is great for two or three people to drink and cook. If you need a lot of water at a time, you might require a larger system. Think of the time saved hauling and trashing bottles, that gives ample patience and glee to the adults at least. Installation is a bit tedious but straightforward enough. And here's a secret superpower: iSpring's customer service is actually super friendly and helpful! After some years the system started dripping (to refill the reservoir) and just didn't stop unless we turned off water. Called CS and they helped us troubleshoot successfully. Yey! If you have no savy at all, get someone to install this for you and set a reminder to replace filter cartridges on schedule. Especially renters profit from the compact and relatively easy system, it takes some space but leaves enough of room under our double sink for two small trash bins and detergents. The shower's got a cheaper filter (which won't waste) and I would NOT drink that water. It's just barely ok on the skin. This water quality's actually impressive given the price of this system is in the low hundreds. Even disregarding eventual medical bills you prevent, you'll save that back financially by just stopping to shop bottled water. We get solid bottles and just refill, wash, refill for up to a year of reusable, high quality plastics or years on end with stainless. Health, economy, even ecology benefit (considering this set lasts us years now and we used to buy plastic bottles, made with a lot of damage to water) - We're very happy.
Review: Great filters, saves money DIY - Works well with no issues. I really appreciate the included push-to-connect fittings, makes the installation much quicker.

## Features

- 【1-Year Water Filtration Replacement Pack】This pack contains individually wrapped high-capacity filter replacement cartridges designed for 6-stage RO systems, providing a full year of filtration. The pack includes 9 filters: 2x sediment filters, 2x granular activated carbon filters, 2x carbon block filters, 1x post-carbon filter, and 2x alkaline filters.
- 【Standard Size RO Replacement Cartridges】iSpring water filter cartridge set fits standard housings that require 10” x 2.5” reverse osmosis water filter cartridges.
- 【Efficient Filtration】Experience clean, safe, and good-tasting water every time you turn on the faucetand, providing a wonderful drinking experience for your whole family. Enjoy crystal clear ice cubes, fresher tea and coffee, better tasting foods, healthier baby formula – even better than most bottled water.
- 【pH-Balanced Alkaline Water Filter】The alkaline mineral filter produces alkaline water with restored healthy minerals such as natural calcium, magnesium, and potassium ions, which ph-balances the RO water. Length: 10", O. D. = 2.5". This alkaline water filter is a great add-on for under sink water filters or reverse osmosis systems.
- 【Please Note】This water filter replacement cartridge pack does NOT include an RO membrane. Updated FA15 alkaline mineral filters and FT15 post-carbon filters are built with a secure push-fit quick connection, which allows faster filter replacement. If you have trouble installing the filters, please refer to the user manual or contact us.

## Technical Specifications

| Specification | Value |
|---------------|-------|
| ASIN | B00BOASJ1M |
| Best Sellers Rank | #1,601 in Tools & Home Improvement ( See Top 100 in Tools & Home Improvement ) #9 in Replacement Under-Sink Water Filters |
| Brand | iSpring |
| Brand Name | iSpring |
| Compatible Water Purifier Models | AquaTru Alkaline, Connect, iSpring RCC7AK |
| Customer Reviews | 4.7 out of 5 stars 4,401 Reviews |
| EU Spare Part Availability Duration | 1 Years |
| External Testing Certification | ANSI |
| Global Trade Identification Number | 00662425058518 |
| Included Components | Water filters |
| Item Dimensions D x W x H | 2.5"D x 2.5"W x 10"H |
| Item Type Name | Water Filter |
| Item Weight | 2.7 Kilograms |
| Manufacturer | iSpring |
| Manufacturer Part Number | F9K |
| Material | Polypropylene, Granular Activated Carbon, Carbon Block |
| Material Type | Polypropylene, Granular Activated Carbon, Carbon Block |
| Model Number | F9K |
| Number of Items | 1 |
| Product Benefits | Removes contaminants and restores healthy minerals for better tasting water |
| Product Dimensions | 2.5"D x 2.5"W x 10"H |
| Set Name | 1-Year Replacement Filter w/AK Set |
| UPC | 662425058518 |
| Unit Count | 9 Count |

## Product Details

- **External Testing Certification:** ANSI
- **Item Weight:** 2.7 Kilograms
- **Material:** Polypropylene, Granular Activated Carbon, Carbon Block
- **Product Benefits:** Removes contaminants and restores healthy minerals for better tasting water
- **Product Dimensions:** 2.5"D x 2.5"W x 10"H

## Images

![F9K NSF Certified 1-Year Reverse Osmosis Water Filter, Alkaline Remineralization Filters for 6-Stage RO Systems, Without RO Membrane - Image 1](https://m.media-amazon.com/images/I/71uhuqS-ucL.jpg)
![F9K NSF Certified 1-Year Reverse Osmosis Water Filter, Alkaline Remineralization Filters for 6-Stage RO Systems, Without RO Membrane - Image 2](https://m.media-amazon.com/images/I/71kdOkMh36L.jpg)
![F9K NSF Certified 1-Year Reverse Osmosis Water Filter, Alkaline Remineralization Filters for 6-Stage RO Systems, Without RO Membrane - Image 3](https://m.media-amazon.com/images/I/71QgD7W1oTL.jpg)
![F9K NSF Certified 1-Year Reverse Osmosis Water Filter, Alkaline Remineralization Filters for 6-Stage RO Systems, Without RO Membrane - Image 4](https://m.media-amazon.com/images/I/71-m6gGdPgL.jpg)
![F9K NSF Certified 1-Year Reverse Osmosis Water Filter, Alkaline Remineralization Filters for 6-Stage RO Systems, Without RO Membrane - Image 5](https://m.media-amazon.com/images/I/716LJhyu65L.jpg)

## Available Options

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

## Customer Reviews

### ⭐⭐⭐⭐⭐ System lasts: Clean water, great taste and feel. Renter friendly price. Nature & we both benefit.
*by A***W on August 27, 2025*

Super system at this price! We've bought it years ago. Of course, the filters fit. We installed the iSpring reverse osmosis set a few years back. It is well worth it's money by now. Water from regular interval filters tastes good to me, and I am sensitive when it comes to water's taste. Can't drink odd or off tastes without cringe. I like arrowhead though not in ecstasy about it, not ok from plastic bottles stored in hot weather except in emergencies. I like some mountain streams and some wood springs, am ok with occasional, light carbonation - though it won't improve the taste, just change and mask it. We also used different $15-30 test strips on occasion throughout the house and this water's our clean baseline. I hate chlorine taste and feel and do not want more iron or lead or PFAS than necessary, either. There's only so much antioxidants can do for us. So, despite the terrible fact that this system wastes 2x the amount of water you get from it (wish we could rig it so the excess watered our garden or plant) - this is totally worth it to me. I try to meditate when filling a bottle to put in the fridge for the day, it takes about 20 seconds. It's not so bad with just a glass, but it also isn't for the super easily annoyed. Our storage canister, which is slowly refilled with pre-filtered water after you tab out some, is great for two or three people to drink and cook. If you need a lot of water at a time, you might require a larger system. Think of the time saved hauling and trashing bottles, that gives ample patience and glee to the adults at least. Installation is a bit tedious but straightforward enough. And here's a secret superpower: iSpring's customer service is actually super friendly and helpful! After some years the system started dripping (to refill the reservoir) and just didn't stop unless we turned off water. Called CS and they helped us troubleshoot successfully. Yey! If you have no savy at all, get someone to install this for you and set a reminder to replace filter cartridges on schedule. Especially renters profit from the compact and relatively easy system, it takes some space but leaves enough of room under our double sink for two small trash bins and detergents. The shower's got a cheaper filter (which won't waste) and I would NOT drink that water. It's just barely ok on the skin. This water quality's actually impressive given the price of this system is in the low hundreds. Even disregarding eventual medical bills you prevent, you'll save that back financially by just stopping to shop bottled water. We get solid bottles and just refill, wash, refill for up to a year of reusable, high quality plastics or years on end with stainless. Health, economy, even ecology benefit (considering this set lasts us years now and we used to buy plastic bottles, made with a lot of damage to water) - We're very happy.

### ⭐⭐⭐⭐⭐ Great filters, saves money DIY
*by O***E on April 24, 2026*

Works well with no issues. I really appreciate the included push-to-connect fittings, makes the installation much quicker.

### ⭐⭐⭐⭐⭐ Professional-Grade Water Restoration | Perfect pH Balance & Seamless Compatibility
*by T***R on April 9, 2026*

I have been running a 6-stage reverse osmosis system for a year, and while RO water is incredibly pure, it can often taste "flat" or become slightly acidic due to the removal of all minerals. I chose the iSpring F9K 1-year replacement pack specifically for the Alkaline Remineralization stage, as I wanted to restore the essential minerals and raise the pH to a more "natural" spring-water level. Filter Quality & NSF Certification • The Build: These aren't generic "knock-off" filters. You can feel the weight difference in the high-capacity sediment and carbon blocks. The fact that they are NSF/ANSI certified provides peace of mind regarding the safety of the materials used (no lead or BPA leaching). • Remineralization Stage (AK Filter): This is the star of the pack. It uses red mineral stones and calcite to add calcium, magnesium, and potassium back into the water. In my testing, it successfully raised the pH of my RO water from a slightly acidic 6.5 to a much more alkaline 8.2. • Carbon Block Efficiency: The 5-micron CTO carbon block is exceptionally dense. I noticed an immediate removal of the slight "chlorine" scent that had begun to creep into my system as the old filters reached the end of their life cycle. Installation & Fitment • Standard Sizing: These are standard 10-inch filters. They fit perfectly into my 10" housings with no "bypass" issues or rattling. • O-Ring Integrity: The seals on the sediment and carbon filters are high-quality rubber. I didn't experience any of the "crimping" or leaks that sometimes occur with lower-tier replacement packs. • Flushing Process: Every carbon filter requires flushing to remove "fines" (loose carbon dust). I ran the system for about 10 minutes, and the water cleared up significantly faster than with previous brands I’ve used, indicating a cleaner manufacturing process. Pros & Cons ✅ Pros: • Comprehensive 1-Year Supply: Includes all pre-filters and the specialized alkaline stage (minus the RO membrane, which usually lasts 2-3 years). • Superior Taste Profile: The remineralization stage gives the water a "crisp" mouthfeel that pure RO water lacks. • System Protection: The high-quality sediment filter does an excellent job of protecting the more expensive RO membrane from clogging. ❌ Cons: • No Membrane Included: As the listing clearly states, this doesn't include the RO membrane. Ensure you check your membrane's age before ordering just this pack. Final Verdict The iSpring F9K is the gold standard for maintaining a 6-stage system. It doesn't just "clean" the water; it "engineers" it for better health and taste. If you value consistent pH levels and want a certified filter that won't leak or bypass, this is a necessary investment for your home’s water quality. Helpful? If this breakdown of the pH levels and filter density helped you, please click the "Helpful" button below!

## Frequently Bought Together

- iSpring F9K NSF Certified 1-Year Reverse Osmosis Water Filter Replacement Pack, Alkaline Remineralization Filters for 6-Stage RO Systems, Without RO Membrane
- iSpring Greatwell Reverse Osmosis Membrane 75 GPD 11.75” X 1.75”, Replacement Fits Standard Under Sink RO Drinking Water Filtration System, MC7
- iSpring AWR2 2-in-1 Reverse Osmosis Pre-Filter Housing and RO Membrane Canister Wrench

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*Product available on Desertcart Croatia*
*Store origin: HR*
*Last updated: 2026-05-15*