---
product_id: 1269808
title: "3M Aqua-Pure AP431 Whole House Scale Inhibition Inline Replacement Water Cartridge For System AP430SS, Genuine 3M Replacement Cartridge"
brand: "aqua-pure"
price: "€ 75.44"
currency: EUR
in_stock: true
reviews_count: 7
url: https://www.desertcart.ie/products/1269808-3m-aqua-pure-ap431-whole-house-scale-inhibition-inline-replacement
store_origin: IE
region: Ireland
---

# 37.9 L/min high flow rate Easy cartridge replacement Polyphosphate scale inhibition tech 3M Aqua-Pure AP431 Whole House Scale Inhibition Inline Replacement Water Cartridge For System AP430SS, Genuine 3M Replacement Cartridge

**Brand:** aqua-pure
**Price:** € 75.44
**Availability:** ✅ In Stock

## Summary

> 💧 Scale-free water, stress-free life — upgrade your flow game!

## Quick Answers

- **What is this?** 3M Aqua-Pure AP431 Whole House Scale Inhibition Inline Replacement Water Cartridge For System AP430SS, Genuine 3M Replacement Cartridge by aqua-pure
- **How much does it cost?** € 75.44 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/1269808-3m-aqua-pure-ap431-whole-house-scale-inhibition-inline-replacement)

## Best For

- aqua-pure enthusiasts

## Why This Product

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

## Key Features

- • **Certified Reliability:** NSF-certified and engineered by 3M for trusted, long-lasting water protection.
- • **Effortless Maintenance:** Designed for quick and simple cartridge swaps—no hassle, no downtime.
- • **High Flow, No Compromise:** Supports up to 10 gallons per minute, perfect for busy households or professional settings.
- • **Maintain Peak Efficiency:** Keeps heating elements free from scale, ensuring your system runs at optimal performance and energy savings.
- • **Protect Your Hot Water Investment:** Polyphosphates actively prevent scale buildup, extending the lifespan of your water heater and plumbing fixtures.

## Overview

The 3M Aqua-Pure AP431 Replacement Cartridge is a high-performance inline water filter designed for the AP430SS system. Utilizing polyphosphate technology, it inhibits scale buildup in hot water heaters and plumbing, maintaining efficiency and extending appliance life. With a robust flow rate of 37.9 L/min (10 gpm), easy replacement, and NSF certification, it’s the smart choice for professionals seeking reliable, low-maintenance water protection.

## Description

HELPS PROTECT HOT WATER HEATERS: Polyphosphates, included in this product, help to inhibit scale buildup in hot water heaters (both standard (gas or electric) and tank-less styles) and boilers. Helps extend the life of hot water heaters and hot water using appliances, pipes, and downstream plumbing fixtures such as faucets and shower heads.

## Features

- Designed for use with 3M Aqua-Pure Whole House Scale Inhibition Inline Water System AP430SS
- HELPS PROTECT HOT WATER HEATERS: Polyphosphates, included in this product, help to inhibit scale buildup in hot water heaters (both standard (gas or electric) and tank-less styles) and boilers. Helps extend the life of hot water heaters and hot water using appliances, pipes, and downstream plumbing fixtures such as faucets and shower heads.
- MAINTAINS EFFICIENCY: By inhibiting scale buildup on heat elements, helps maintain water heater efficiency.
- EASY TO REPLACE: Easy change-out makes system maintenance easy.
- HIGH FLOW RATES: Rated for up to 10 gallons per minute (gpm).
- PRODUCT SPECIFICATIONS: System has a pressure range of 25-125 PSI (862 kPa) and operating temperature of 40-100F (4.4-37.8C).
- Inhibits scale buildup and corrosion
- High capacity change every 4-6 months

## Technical Specifications

| Specification | Value |
|---------------|-------|
| Material | Polypropylene (PP) |
| Product Dimensions | 2.8"D x 2.8"W x 12.99"H |
| Item Weight | 0.45 Kilograms |
| External Testing Certification | NSF |
| Product Benefits | Inhibits Lime-Scale Growth |
| Brand | Aqua-Pure |
| Set Name | AP430SS |
| UPC | 051128889886 |
| Global Trade Identification Number | 00051128889886, 50051128889881 |
| Unit Count | 1.0 Count |
| Compatible Water Purifier Models | 3M AP430SS, 3M AP431 |
| Number of Items | 1 |
| Manufacturer | 3M |
| Part Number | AP431 |
| Item Weight | 15.8 ounces |
| Item model number | AP43110 |
| Is Discontinued By Manufacturer | No |
| Size | 1 Count (Pack of 1) |
| Color | White |
| Style | AP431 Cartridge |
| Item Package Quantity | 1 |
| Number Of Pieces | 1 |
| Flow Rate | 37.9 Liters Per Minute |
| Included Components | Replacement Cartridge |
| Batteries Included? | No |
| Batteries Required? | No |
| Warranty Description | Warranty |

## Product Details

- **Material:** Polypropylene (PP)
- **Product Dimensions:** 2.8"D x 2.8"W x 12.99"H
- **Item Weight:** 0.45 Kilograms
- **External Testing Certification:** NSF
- **Product Benefits:** Inhibits Lime-Scale Growth

## Images

![3M Aqua-Pure AP431 Whole House Scale Inhibition Inline Replacement Water Cartridge For System AP430SS, Genuine 3M Replacement Cartridge - Image 1](https://m.media-amazon.com/images/I/6179XkOmyJL.jpg)

## Available Options

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

## Questions & Answers

**Q: Can I used this with a spa steam generator?  Or do I need a sediment filter. Don't know what the difference is. If you can help please respond.**
A: So much misinformation here.  This device is for treating water input to a tankless water heater in a NON-municipal water system; i.e.,  private well water. This device is NOT a filter. The device slowly dissolves polyphosphates in the water. It ADDS polyphosphates which bond to inorganic chemicals: iron, manganese, etc., that is in the water.  These create a thin coat in the plumbing which prevents decomposition of metals in the water lines; copper, lead, etc. and it prevents the buildup of scale. HOWEVER, most public water treatment facilities ALREADY add polyphosphates to the municipal  water, so adding this to a home system is redundant, but could be considered a backup/sure thing that inhibition is accomplished. However, for tankless heaters on a municipal water system, do the flushing with vinegar as recommended by the tankless heater manufacturer to remove a six-month buildup of scale in the heater to clear the heater of built up scale.

**Q: How do you know when to change out the filter? Is there a gauage on the filter to show you when it is full of dirt?**
A: This is not a filter so it will never be full of dirt.

Best practice for this and all your home filter needs is to just change everything on your birthday.

The manufacture recommends changing the cartridge (not a filter) when there is still about 1/3 of the polyphosate beads remaining.

**Q: What is the thread size at the top of the filter?**
A: Hi, CJ - there is no info on that in the papers that come with this unit - but when first installed, you need to buy the matching 'T'-shaped pipe that fits the threads exactly. It's a wide thread and screws on very easily. It looks like what's seen here: http://www.amazon.com/Aqua-Pure-AP430SS-Water-System-Protector/dp/B000NKETXQ/ref=pd_sim_indust_1?ie=UTF8&refRID=1745KNPBDAPFBECRDNY6    you buy this tee and have it installed one time, then just buy the filters. I think Amazon quit carrying them, there are other options, last time I got three to save on shipping. Hope this helps.

**Q: Is the active ingredient polyphosphate? Can I use this to protect against corrosion within the copper pipes?**
A: The device contains polyphosphate beads. The water flows over the beads which attach to inorganics in the water that could cause scale buildup in the tankless heater. Won't do much good against corrosion of copper pipes which generally can last 50 to ONE HUNDRED YEARS! This is a pre-treatment of water going into a tankless water heater. Note that chlorine from a municipal water system will also degrade the beads. This device is best on a system using well hard water.

## Customer Reviews

### ⭐⭐⭐⭐⭐ Works great but needs to be flushed after initial install and filter changes.
*by J***E on August 30, 2025*

Be sure to flush the filter with something that doesn’t have a fine filters for 5-10 mins or so after installation. I have those electric smart toilets and it filled the bowls with little pieces black plastic and clogged their inline filters. Game changer in water quality. My showers and appliances are as grateful as I am. ZERO spots on the shower doors or sinks.

### ⭐⭐⭐⭐⭐ Good replacement cartridge
*by W***E on January 26, 2025*

The installers of my gas boiler put this scale inhibition system in along with everything else so I just needed the replacement cartridge. It fit perfectly with no threading issues others have mentioned, went right in first time and sealed tight, no leaks. Did not use Teflon tape as it is not needed for the cartridge.

### ⭐⭐⭐⭐⭐ Polyphosphate Power! ... Evil Calcium Trembles!
*by J***N on May 9, 2018*

Works with magic and unicorn tears. :o)It is not a filter. It is a water treatment system.The stainless steel head is robust and a nice solid chunk of metal. Easily could withstand brazing/soldering, on the spot, with the cartridge off.The 3/4" NPT inlet and outlet has nearly a clear flow path, so your GPM, will not be reduced. Install a ball or gate valve in front to permit easy cartridge changeouts.The tee must be orientated to the water flow, use the arrow on the side of the tee, for the water to get treated while flowing.There is an elevated tab in the tee with a single hole for directing a small portion of the water down into the center whole of the cartridge.The water slowly dissolves a small amount of food-grade polyphosphate from the beads and, using the venturi effect, the water is then pulled back through the 8 holes in the cartridge perimeter and through the 3 holes in the tee, surrounding the center tab, to mix with the flowing water.Only 2 to 3 ppm is needed to treat for scale.From past uses at a different home, I've gotten about 20,000 gallons out of a cartridge with still some beads rattling in the bottom when replacing the cartridge.I would say that if you used less than 2,000 gallons a month then one cartridge should easily last a year.The cartridge threads are plastic and you can easily cross-thread them if you get in a hurry replacing the cartridge. Just make sure you get the threads started straight and it screws up with no problems.The threads do no provide the seal, it is the o-ring so once hand-tight that is tight enough.

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*Product available on Desertcart Ireland*
*Store origin: IE*
*Last updated: 2026-02-25*