---
product_id: 313369634
title: "AP431 AP430SS Whole House Scale Inhibitor Filter, Heater Softener System, Prevent Scale Build Up On Hot Water Heaters, Pipes and Boilers"
brand: "waterdrop"
price: "$110.18"
currency: USD
in_stock: true
reviews_count: 13
category: "Waterdrop"
url: https://www.desertcart.us/products/313369634-ap431-ap430ss-whole-house-scale-inhibitor-filter-heater-softener-system
store_origin: US
region: United States of America
---

# Durable 304 stainless steel adapter 10 GPM high flow rate Food-grade polyphosphates inhibit scale AP431 AP430SS Whole House Scale Inhibitor Filter, Heater Softener System, Prevent Scale Build Up On Hot Water Heaters, Pipes and Boilers

**Brand:** waterdrop
**Price:** $110.18
**Availability:** ✅ In Stock

## Summary

> 💧 Protect your home’s water flow and save on energy — scale buildup is so last decade!

## Quick Answers

- **What is this?** AP431 AP430SS Whole House Scale Inhibitor Filter, Heater Softener System, Prevent Scale Build Up On Hot Water Heaters, Pipes and Boilers by waterdrop
- **How much does it cost?** $110.18 with free shipping
- **Is it available?** Yes, in stock and ready to ship
- **Where can I buy it?** [www.desertcart.us](https://www.desertcart.us/products/313369634-ap431-ap430ss-whole-house-scale-inhibitor-filter-heater-softener-system)

## 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

- • **Hassle-Free Maintenance:** Each cartridge lasts up to 6 months, making upkeep simple and reliable for busy professionals.
- • **Premium, Safe Materials:** Constructed with BPA-free, food-grade components and rust-resistant stainless steel for health and durability.
- • **Effortless Scale Defense:** Food-grade polyphosphates actively prevent scale buildup, protecting your entire water system.
- • **Uninterrupted Water Flow:** 3/4" NPT inlet/outlet supports a robust 10 GPM flow rate, ensuring stable water pressure throughout your home.
- • **Maximized Appliance Lifespan:** Extend the life of your water heater, dishwasher, and boilers by maintaining peak efficiency.

## Overview

The Waterdrop AP431 AP430SS Whole House Scale Inhibitor Filter uses food-grade polyphosphates and a durable stainless steel adapter to prevent scale buildup in water heaters, pipes, and boilers. With a high flow rate of 10 GPM and BPA-free materials, it safeguards your plumbing system while extending appliance lifespan. Easy to install and maintain, each cartridge lasts up to 6 months, making it an efficient solution for healthier, energy-saving water management.

## Description

Waterdrop AP431 AP430SS Whole House Scale Inhibitor Filter, Heater Softener System, Prevent Scale Build Up On Hot Water Heaters, Pipes and Boilers - desertcart.com

Review: Great Customer Service - Re-doing my product review , after a failed attempt to make this item work , I made a " bad " review on this item , after posting it here , I got an email from Kimberly from Customer Service to let me know she could send me a new filter set up If I would give them an other chance , I said yes , next day or two I had a new box with a new filter set up , I got really impress by the way they wanted to make things right about their product , so After few days , I finally got to do another set up with the filter on the new tankless water heater in my house , set up was easy this time after Kimberly gave me some pointers of what I should do this time in order to not have a leak , I fallow her instructions and I am happy to say that the system works as advertised ! No leaks and I am really happy that the new set up works perfectly ! Thanks to Kimberly for her time and effort to make things right on their product . Recommend it 100% !
Review: Working with second unit - Update: I was able to get in contact with their customer service. They sent me a new unit which arrived in a couple of days. Installed exactly the same way as I tried with the first one, but no leaks this time! I'm not sure why there's some issues with these units. It looks like other reviewers had issues too but they were also fixed with a new unit. Thank you waterdrop customer service! I installed the whole house scale inhibitor filter, but unfortunately it's leaking. I've clamped the fittings, but unfortunately water leaks from the waterdrop unit. I haven't had luck reaching customer support leaving a review here as that seems to have worked for others.

## Features

- 【Efficient Scale Inhibition】Food-grade polyphosphates, included in the Waterdrop scale inhibitor, can fundamentally inhibit scale formation to provide healthy water for you. This is a highlight different from conventional filters.
- 【Energy Conservation】This scale inhibitor can protect your water heater, dishwasher, boilers, downstream plumbing fixtures like faucets and shower heads from scale buildup while improving the efficiency of electrical appliances, and extending their life.
- 【High Flow Rate】3/4 " NPT inlet/outlet ensures high flow rate of 10 GPM to keep stable water pressure. This scale inhibitor system can be installed on any pipeline adaptive to its interface.
- 【Premium Material】This scale inhibitor system is equipped with a durable and anti-rusting 304 stainless steel adapter. Besides, its food-grade and BPA-free materials safeguard healthy water. Please note - this system is NOT a regular pre-filter. So it doesn't force all the water through the filter like a normal filter. Only a portion of the source water will flow through the filter to absorb food-grade polyphosphates for better filtration.
- 【Longer Lifespan】Enjoy purified water with this inline scale inhibition system. Every water cartridge can last for 6 months for regular use, which may vary based on local water quality. Please maintain this scale inhibitor system in an upright position during installation to get better inhibition effect. Be sure to install this system on a cold water supply line that supplies water to a water heater.
- Included Components：3/4” NPT inlet/outlet connection, Replacement Cartridge*1. Please NOTE, Waterdrop is an independent brand. The model name of this product is WD-W65.

## Technical Specifications

| Specification | Value |
|---------------|-------|
| ASIN | B08LPBPVPS |
| Best Sellers Rank | #14,044 in Tools & Home Improvement ( See Top 100 in Tools & Home Improvement ) #34 in Under-Sink & Countertop Filtration |
| Brand | Waterdrop |
| Customer Reviews | 4.4 4.4 out of 5 stars (825) |
| Date First Available | November 26, 2020 |
| External Testing Certification | RoHS |
| Item Weight | 1.85 pounds |
| Item model number | WD-W65 |
| Manufacturer | Waterdrop |
| Material | Stainless Steel and Food-grade polyphosphates |
| Number of Items | 1 |
| Product Benefits | Inhibits Lime-Scale Growth |
| Product Dimensions | 2.5"D x 2.5"W x 12.5"H |
| Set Name | Single |
| UPC | 840814194058 |
| Unit Count | 1.0 Count |

## Product Details

- **Brand:** Waterdrop
- **External Testing Certification:** RoHS
- **Material:** Stainless Steel and Food-grade polyphosphates
- **Product Benefits:** Inhibits Lime-Scale Growth
- **Product Dimensions:** 2.5"D x 2.5"W x 12.5"H

## Images

![AP431 AP430SS Whole House Scale Inhibitor Filter, Heater Softener System, Prevent Scale Build Up On Hot Water Heaters, Pipes and Boilers - Image 1](https://m.media-amazon.com/images/I/51g2GDHdzVL.jpg)

## Questions & Answers

**Q: Will this work mounted on its side, or does it have to be upright?**
A: Dear Tydi,

Thank you for your inquiry. Regarding this issue, this whole house scale inline water system can only be installed upright.
If you need any further assistance, please feel free to contact us at 1-888-352-3558 (8:00 AM - 5:00 PM PST, Mon - Fri). Thank you.

Kind Regards
Mia Lauren
Customer Service Rep

**Q: Filter included?**
A: Dear customer,
Thank you for your inquiry. Regarding this issue, this system includes a filter cartridge and 3/4" NPT inlet/outlet connections.
Please contact us at 1-888-352-3558 (8:00 AM - 5:00 PM PST, Mon - Fri) if you have any other questions. Thank you.

Kind Regards,
Mia Lauren
Customer Service Rep

**Q: what is the reason for only installing on the hot water line?  Would like to use for entire house, cold water also.**
A: Hi,
Thanks for your interest in our AP431 filter product.
Please note that this is only designed for cold water line; it is designed to protect water heater placed after it, thank you.

If you have contacted us via email but received no reply, please check the Spam/Junk Folder first. Thank you.

If you have any other inquiries, please feel free to contact us.
1-888-352-3558

Kind Regards
Mia Lauren　
Customer Service Rep

**Q: Are other parts or items needed? Or can you really filter your entire house water with just this? Where do you install it?**
A: Hi,
Thanks for your interest in our product. 

Please note that this is a scale inhibitor. When using this scale inhibition system, we recommend installing a pre-filter as well.You need to install it behind the water meter.
https://www.amazon.com/dp/B08XXJSN29/  


If you have any other questions, please feel free to contact us.

Enjoy the rest of your day!

Kind Regards
Mia Lauren　
Customer Service Rep

## Customer Reviews

### ⭐⭐⭐⭐⭐ Great Customer Service
*by O***A on July 29, 2025*

Re-doing my product review , after a failed attempt to make this item work , I made a " bad " review on this item , after posting it here , I got an email from Kimberly from Customer Service to let me know she could send me a new filter set up If I would give them an other chance , I said yes , next day or two I had a new box with a new filter set up , I got really impress by the way they wanted to make things right about their product , so After few days , I finally got to do another set up with the filter on the new tankless water heater in my house , set up was easy this time after Kimberly gave me some pointers of what I should do this time in order to not have a leak , I fallow her instructions and I am happy to say that the system works as advertised ! No leaks and I am really happy that the new set up works perfectly ! Thanks to Kimberly for her time and effort to make things right on their product . Recommend it 100% !

### ⭐⭐⭐⭐⭐ Working with second unit
*by C***R on October 16, 2025*

Update: I was able to get in contact with their customer service. They sent me a new unit which arrived in a couple of days. Installed exactly the same way as I tried with the first one, but no leaks this time! I'm not sure why there's some issues with these units. It looks like other reviewers had issues too but they were also fixed with a new unit. Thank you waterdrop customer service! I installed the whole house scale inhibitor filter, but unfortunately it's leaking. I've clamped the fittings, but unfortunately water leaks from the waterdrop unit. I haven't had luck reaching customer support leaving a review here as that seems to have worked for others.

### ⭐⭐⭐⭐⭐ Great filter, long lasting!
*by P***S on November 8, 2025*

Once you get the bugger in, works great. If you have a fridge like mine, you understand the annoyance of changing the filter. For mine you have to lay on the floor (literally!) and don't forget to take a pair of pliers down with you because you'll never turn that bugger without them. Then change it out and put the fridge back together (I have to remove the baseboard thing). After you do all that you are sooo happy that this filter lasts a looong time! I don't bother with setting the calendar, I can taste the change in the water when I need to replace it.

## Frequently Bought Together

- 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 3
- HYDRO MASTER Tankless Water Heater Service Valve Kit with Pressure Relief Valve 3/4-Inch IPS Isolator Clean Brass

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*Product available on Desertcart United States of America*
*Store origin: US*
*Last updated: 2026-02-22*