--- product_id: 223866737 title: "Waterdrop AP431 Replacement Cartridge for Aqua-Pure AP431, Pack of 1" brand: "waterdrop" price: "$61.83" currency: USD in_stock: true reviews_count: 8 category: "Waterdrop" url: https://www.desertcart.us/products/223866737-waterdrop-ap431-replacement-cartridge-for-aqua-pure-ap431-pack-1 store_origin: US region: United States of America --- # 6-month extended lifespan 10 GPM stable flow BPA-free anti-burst housing Waterdrop AP431 Replacement Cartridge for Aqua-Pure AP431, Pack of 1 **Brand:** waterdrop **Price:** $61.83 **Availability:** ✅ In Stock ## Summary > 💧 Keep your water flowing flawlessly — because your home deserves the best! ## Quick Answers - **What is this?** Waterdrop AP431 Replacement Cartridge for Aqua-Pure AP431, Pack of 1 by waterdrop - **How much does it cost?** $61.83 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/223866737-waterdrop-ap431-replacement-cartridge-for-aqua-pure-ap431-pack-1) ## 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 - • **Consistent High Flow:** Delivers up to 10 gallons per minute, maintaining optimal water pressure for all your household needs. - • **Leak-Proof Durability:** Crafted with food-grade BPA-free plastic, ensuring a secure, anti-burst fit for worry-free water safety. - • **Seamless Compatibility:** Perfectly interchangeable with 3M Aqua-Pure AP431 series and related models for easy upgrades. - • **Effortless Scale Defense:** Premium polyphosphates actively prevent limescale buildup, protecting your appliances and plumbing. - • **Long-Lasting Performance:** Replace every 6 months to enjoy uninterrupted, clean water and maximum appliance efficiency. ## Overview The Waterdrop AP431 Replacement Cartridge is a premium scale inhibitor designed to protect water-using appliances by preventing corrosion and limescale buildup. Featuring a BPA-free, anti-burst housing and delivering a stable flow rate of up to 10 gallons per minute, it ensures safe, efficient water filtration. Compatible with multiple 3M Aqua-Pure models, this cartridge offers a reliable 6-month lifespan for sustained performance and easy maintenance. ## Description Buy Waterdrop AP431 Replacement Cartridge for Aqua-Pure AP431, Pack of 1 | Hot Water Scale Inhibitor for AP430SS, Prevent Scale Accumulation and Protect Water Heaters: Replacement Under-Sink Water Filters - desertcart.com ✓ FREE DELIVERY possible on eligible purchases Review: Economical replacement - The perfect replacement for the 3M water filter. The water flow remains constant. Review: Hot Water Tank Filter - Yes, it arrived as stated and it was easy replacing. ## 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 | B089W9TSJG | | Best Sellers Rank | #51,463 in Tools & Home Improvement ( See Top 100 in Tools & Home Improvement ) #358 in Replacement Under-Sink Water Filters | | Brand | Waterdrop | | Brand Name | Waterdrop | | Compatible Water Purifier Models | 3M SF18-S | | Customer Reviews | 4.5 out of 5 stars 369 Reviews | | External Testing Certification | RoHS | | Included Components | Scale Inhibitor Cartridge*1 | | Item Dimensions D x W x H | 2.56"D x 2.56"W x 9.45"H | | Item Weight | 1 Pounds | | Manufacturer | Waterdrop | | Manufacturer Part Number | WD-AP431 | | Material | food-grade polyphosphates | | Material Type | food-grade polyphosphates | | Model Number | WD-W65 | | Number of Items | 1 | | Product Benefits | Prevent Scale Accumulation | | Product Dimensions | 2.56"D x 2.56"W x 9.45"H | | Set Name | Aqua-Pure AP431 | | UPC | 840814177495 | | Unit Count | 1.0 Count | ## Product Details - **External Testing Certification:** RoHS - **Item Weight:** 1 Pounds - **Material:** food-grade polyphosphates - **Product Benefits:** Prevent Scale Accumulation - **Product Dimensions:** 2.56"D x 2.56"W x 9.45"H ## Images ![Waterdrop AP431 Replacement Cartridge for Aqua-Pure AP431, Pack of 1 - Image 1](https://m.media-amazon.com/images/I/5140+mcg8XL.jpg) ![Waterdrop AP431 Replacement Cartridge for Aqua-Pure AP431, Pack of 1 - Image 2](https://m.media-amazon.com/images/I/71RhF1mrTFL.jpg) ![Waterdrop AP431 Replacement Cartridge for Aqua-Pure AP431, Pack of 1 - Image 3](https://m.media-amazon.com/images/I/71ZQpJfuRbL.jpg) ![Waterdrop AP431 Replacement Cartridge for Aqua-Pure AP431, Pack of 1 - Image 4](https://m.media-amazon.com/images/I/71m6CsS7c2L.jpg) ![Waterdrop AP431 Replacement Cartridge for Aqua-Pure AP431, Pack of 1 - Image 5](https://m.media-amazon.com/images/I/81UTr-gamcL.jpg) ## Customer Reviews ### ⭐⭐⭐⭐⭐ Economical replacement *by B***N on May 8, 2026* The perfect replacement for the 3M water filter. The water flow remains constant. ### ⭐⭐⭐⭐⭐ Hot Water Tank Filter *by D***D on April 25, 2026* Yes, it arrived as stated and it was easy replacing. ### ⭐⭐⭐⭐⭐ Well worth it! *by D***N on May 1, 2026* Finally, a filter at a reasonable price. No problems with it. ## 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 1 - 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 --- ## Why Shop on Desertcart? - 🛒 **Trusted by 1.3+ Million Shoppers** — Serving international shoppers since 2016 - 🌍 **Shop Globally** — Access 737+ million products across 21 categories - 💰 **No Hidden Fees** — All customs, duties, and taxes included in the price - 🔄 **15-Day Free Returns** — Hassle-free returns (30 days for PRO members) - 🔒 **Secure Payments** — Trusted payment options with buyer protection - ⭐ **TrustPilot Rated 4.5/5** — Based on 8,000+ happy customer reviews **Shop now:** [https://www.desertcart.us/products/223866737-waterdrop-ap431-replacement-cartridge-for-aqua-pure-ap431-pack-1](https://www.desertcart.us/products/223866737-waterdrop-ap431-replacement-cartridge-for-aqua-pure-ap431-pack-1) --- *Product available on Desertcart United States of America* *Store origin: US* *Last updated: 2026-07-21*