---
product_id: 222482963
title: "Waterdrop AP431 Replacement Cartridge for Aqua-Pure AP431 Hot Water Scale Inhibitor for AP430SS, Prevent Scale Accumulation and Protect Water Heaters, Pack of 3"
brand: "waterdrop"
price: "22072 som"
currency: KGS
in_stock: true
reviews_count: 8
category: "Waterdrop"
url: https://www.desertcart.kg/products/222482963-waterdrop-ap431-replacement-cartridge-for-aqua-pure-ap431-hot-water
store_origin: KG
region: Kyrgyzstan
---

# 6-month lifespan 10 gpm flow rate BPA-free housing Waterdrop AP431 Replacement Cartridge for Aqua-Pure AP431 Hot Water Scale Inhibitor for AP430SS, Prevent Scale Accumulation and Protect Water Heaters, Pack of 3

**Brand:** waterdrop
**Price:** 22072 som
**Availability:** ✅ In Stock

## Summary

> 💦 Keep Your Water Flowing Smoothly!

## Quick Answers

- **What is this?** Waterdrop AP431 Replacement Cartridge for Aqua-Pure AP431 Hot Water Scale Inhibitor for AP430SS, Prevent Scale Accumulation and Protect Water Heaters, Pack of 3 by waterdrop
- **How much does it cost?** 22072 som with free shipping
- **Is it available?** Yes, in stock and ready to ship
- **Where can I buy it?** [www.desertcart.kg](https://www.desertcart.kg/products/222482963-waterdrop-ap431-replacement-cartridge-for-aqua-pure-ap431-hot-water)

## Best For

- waterdrop enthusiasts

## Why This Product

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

## Key Features

- • **Rapid Water Flow:** Enjoy a steady 10 gpm flow rate for all your needs.
- • **Eco-Friendly Choice:** Made from food-grade materials for safe water use.
- • **Seamless Compatibility:** Perfect fit for Aqua-Pure models, ensuring no leaks.
- • **Protect Your Investment:** Safeguard your appliances from limescale and corrosion.
- • **Long-Lasting Performance:** Replace every 6 months for optimal efficiency.

## Overview

The WaterdropAP431 Replacement Cartridge is designed to prevent scale accumulation and protect your water heaters and appliances. With a flow rate of up to 10 gallons per minute, this BPA-free cartridge ensures optimal performance and longevity, making it a smart choice for maintaining your home’s water systems.

## Description

desertcart.com: Waterdrop AP431 Replacement Cartridge for Aqua-Pure AP431 Hot Water Scale Inhibitor for AP430SS, Prevent Scale Accumulation and Protect Water Heaters, Pack of 3 : Tools & Home Improvement

Review: Great replacement - fits perfectly and works well - This Waterdrop AP431 replacement cartridge is an excellent alternative to the OEM Aqua-Pure AP431 filter. It fits my whole house water filter system perfectly with no modifications needed—drops right in just like the original cartridge. The water quality after installation is noticeably improved with better taste and clarity. No chlorine taste or odor, and the flow rate is excellent. The filtration performance seems just as good as the original filters but at a much better price point. The build quality is solid with good materials and construction. The threads sealed properly without any leaks, and the cartridge housing feels sturdy. Installation was quick and straightforward—just standard filter replacement procedure. I've been using these Waterdrop replacements for several cycles now and they consistently perform well. The longevity seems comparable to OEM filters, making them an even better value. No decrease in water pressure or quality over the filter's lifespan. For anyone looking to save money on replacement water filters without sacrificing quality, these Waterdrop cartridges are the way to go. They work just as well as the brand name filters at a fraction of the cost.
Review: Good replacement for Aqua-Pure - I have started purchasing and using these replacement cartridges for all of my Aqua-Pure descale installations. I am a plumbing contractor, so I perform annual maintenance service to all my customers that have tankless water heaters. This includes replacing the cartridge when I do the descale operation using a recirculating pump and vinegar solution (many videos on youtube on how to do this). I Install the stainless steel tee, which is supplied with the complete scale inhibitor kit (available on desertcart), on a horizontal section of the cold water pipe downstream of the shut-off, before the flexible corrugated connector on the inlet to the tankless water heater. I also use 3/4" brass or stainles steel nipples (not galvanized steel!) on either side of the tee, but typically on the outlet for the female union of the flexible connector. These cartridges have proven as reliable as the Aqua-pure that I normally use, at a reduced cost. These are NOT filters, as many people assume. They are in-line water treatment system which uses polyphosphates to inhibit hard-water scale buildup. I have used this system for many years to protect the internal heat exchange chamber on all of the tankless water heaters that I install for my customers. You could also install these on the cold water line coming into your house as a whole-house water treatment, but you would probably want to replace them more often due to increased use. I hope this info has been helpful - cheers!

## Features

- 【Protects your water-using appliances】: With the premium polyphosphates in this scale inhibitor cartridge, you can worry less about the accumulation of corrosion and limescale, which may block your pipelines. This efficient filter media will keep your water-using appliances—like dishwashers, heaters, etc.—working optimally and for the longest time possible
- 【Anti-burst properties】: The cartridge housing is made from food-grade BPA-free plastic and fits the original brand perfectly, without any leaks. With its state-of-the-art technology, the scale inhibitor cartridge ensures a safe water use experience
- 【Fast water flow】: With a continuous flow of filtered water at a stable pressure and a flow rate of up to 10 gpm, this scale inhibitor cartridge is designed to provide water for your domestic requirements
- 【Extended lifespan】: Enjoy clean water by replacing your cartridge every 6 months, which will vary based on water conditions. Throughout this time frame, you will get maximum performance
- 【Replacement models】: Replacement for 3M Aqua-Pure AP430, AP430SS, and SF18-S Scale Inhibition System. Interchangeable with 3M Aqua-Pure AP431, HF8-S, KleenWater KW431

## Technical Specifications

| Specification | Value |
|---------------|-------|
| ASIN | B089W6SJF1 |
| Best Sellers Rank | #16,728 in Tools & Home Improvement ( See Top 100 in Tools & Home Improvement ) #145 in Replacement Under-Sink Water Filters |
| Brand | Waterdrop |
| Compatible Water Purifier Models | 3M SF18-S |
| Customer Reviews | 4.7 4.7 out of 5 stars (664) |
| Date First Available | June 9, 2020 |
| External Testing Certification | RoHS |
| Item Weight | 1.9 pounds |
| Item model number | WD-W65 |
| Manufacturer | Waterdrop |
| Material | Food-grade polyphosphates |
| Number of Items | 3 |
| Product Benefits | Inhibits Lime-Scale Growth |
| Product Dimensions | 2.56"D x 2.56"W x 9.45"H |
| UPC | 840814177501 |
| Unit Count | 3.0 Count |

## Product Details

- **External Testing Certification:** RoHS
- **Item Weight:** 1.9 Pounds
- **Material:** Food-grade polyphosphates
- **Product Benefits:** Inhibits Lime-Scale Growth
- **Product Dimensions:** 2.56"D x 2.56"W x 9.45"H

## Images

![Waterdrop AP431 Replacement Cartridge for Aqua-Pure AP431 Hot Water Scale Inhibitor for AP430SS, Prevent Scale Accumulation and Protect Water Heaters, Pack of 3 - Image 1](https://m.media-amazon.com/images/I/41+-UR7B7GL.jpg)
![Waterdrop AP431 Replacement Cartridge for Aqua-Pure AP431 Hot Water Scale Inhibitor for AP430SS, Prevent Scale Accumulation and Protect Water Heaters, Pack of 3 - Image 2](https://m.media-amazon.com/images/I/418X6xuwKcL.jpg)
![Waterdrop AP431 Replacement Cartridge for Aqua-Pure AP431 Hot Water Scale Inhibitor for AP430SS, Prevent Scale Accumulation and Protect Water Heaters, Pack of 3 - Image 3](https://m.media-amazon.com/images/I/41D1VsW6loL.jpg)
![Waterdrop AP431 Replacement Cartridge for Aqua-Pure AP431 Hot Water Scale Inhibitor for AP430SS, Prevent Scale Accumulation and Protect Water Heaters, Pack of 3 - Image 4](https://m.media-amazon.com/images/I/41QI4LU7R-L.jpg)
![Waterdrop AP431 Replacement Cartridge for Aqua-Pure AP431 Hot Water Scale Inhibitor for AP430SS, Prevent Scale Accumulation and Protect Water Heaters, Pack of 3 - Image 5](https://m.media-amazon.com/images/I/41Si9SwAlFL.jpg)

## Customer Reviews

### ⭐⭐⭐⭐⭐ Great replacement - fits perfectly and works well
*by P***O on October 28, 2025*

This Waterdrop AP431 replacement cartridge is an excellent alternative to the OEM Aqua-Pure AP431 filter. It fits my whole house water filter system perfectly with no modifications needed—drops right in just like the original cartridge. The water quality after installation is noticeably improved with better taste and clarity. No chlorine taste or odor, and the flow rate is excellent. The filtration performance seems just as good as the original filters but at a much better price point. The build quality is solid with good materials and construction. The threads sealed properly without any leaks, and the cartridge housing feels sturdy. Installation was quick and straightforward—just standard filter replacement procedure. I've been using these Waterdrop replacements for several cycles now and they consistently perform well. The longevity seems comparable to OEM filters, making them an even better value. No decrease in water pressure or quality over the filter's lifespan. For anyone looking to save money on replacement water filters without sacrificing quality, these Waterdrop cartridges are the way to go. They work just as well as the brand name filters at a fraction of the cost.

### ⭐⭐⭐⭐⭐ Good replacement for Aqua-Pure
*by B***S on March 4, 2023*

I have started purchasing and using these replacement cartridges for all of my Aqua-Pure descale installations. I am a plumbing contractor, so I perform annual maintenance service to all my customers that have tankless water heaters. This includes replacing the cartridge when I do the descale operation using a recirculating pump and vinegar solution (many videos on youtube on how to do this). I Install the stainless steel tee, which is supplied with the complete scale inhibitor kit (available on Amazon), on a horizontal section of the cold water pipe downstream of the shut-off, before the flexible corrugated connector on the inlet to the tankless water heater. I also use 3/4" brass or stainles steel nipples (not galvanized steel!) on either side of the tee, but typically on the outlet for the female union of the flexible connector. These cartridges have proven as reliable as the Aqua-pure that I normally use, at a reduced cost. These are NOT filters, as many people assume. They are in-line water treatment system which uses polyphosphates to inhibit hard-water scale buildup. I have used this system for many years to protect the internal heat exchange chamber on all of the tankless water heaters that I install for my customers. You could also install these on the cold water line coming into your house as a whole-house water treatment, but you would probably want to replace them more often due to increased use. I hope this info has been helpful - cheers!

### ⭐⭐⭐⭐⭐ Fits.
*by C***R on November 5, 2025*

Works.

## Frequently Bought Together

- Waterdrop AP431 Replacement Cartridge for Aqua-Pure AP431 Hot Water Scale Inhibitor for AP430SS, Prevent Scale Accumulation and Protect Water Heaters, Pack of 3
- Waterdrop AP431 AP430SS Whole House Scale Inhibitor Filter, Heater Softener System, Prevent Scale Build Up On Hot Water Heaters, Pipes and Boilers
- Waterdrop AP431 Replacement Cartridge for Aqua-Pure AP431 Hot Water Scale Inhibitor for AP430SS, Prevent Scale Accumulation and Protect Water Heaters, Pack of 1

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*Product available on Desertcart Kyrgyzstan*
*Store origin: KG*
*Last updated: 2026-01-24*