--- product_id: 222482963 title: "AP431 Replacement Cartridge for Aqua-Pure® AP431, 3 Pack | Water Filter, Replacement Cartridge for Aqua-Pure® AP430SS, Helps Prevent Scale Build Up On Hot Water Heaters and Boilers" brand: "waterdrop" price: "$132.04" currency: USD in_stock: true category: "Waterdrop" url: https://www.desertcart.us/products/222482963-ap431-replacement-cartridge-for-aqua-pure-ap431-3-pack-water store_origin: US region: United States of America --- # 6-month extended lifespan 10 GPM fast flow rate BPA-free anti-burst housing AP431 Replacement Cartridge for Aqua-Pure® AP431, 3 Pack | Water Filter, Replacement Cartridge for Aqua-Pure® AP430SS, Helps Prevent Scale Build Up On Hot Water Heaters and Boilers **Brand:** waterdrop **Price:** $132.04 **Availability:** ✅ In Stock ## Summary > 💧 Keep your water flowing flawlessly — because your appliances deserve the best! ## Quick Answers - **What is this?** AP431 Replacement Cartridge for Aqua-Pure® AP431, 3 Pack | Water Filter, Replacement Cartridge for Aqua-Pure® AP430SS, Helps Prevent Scale Build Up On Hot Water Heaters and Boilers by waterdrop - **How much does it cost?** $132.04 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/222482963-ap431-replacement-cartridge-for-aqua-pure-ap431-3-pack-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 - • **Consistent Water Flow:** Delivers a stable pressure with up to 10 gallons per minute, meeting all your domestic water needs effortlessly. - • **Leak-Proof Durability:** Crafted with food-grade BPA-free plastic, this cartridge fits perfectly with zero leaks for worry-free use. - • **Scale-Free Performance:** Premium polyphosphates protect your appliances from corrosion and limescale buildup, ensuring peak efficiency. - • **Seamless Compatibility:** Direct replacement for multiple 3M Aqua-Pure models, making upgrades and maintenance hassle-free. - • **Long-Lasting Reliability:** Replace every 6 months to maintain maximum filtration performance tailored to your water conditions. ## Overview The Waterdrop AP431 Replacement Cartridge 3-pack offers advanced scale inhibition with premium polyphosphates, protecting water-using appliances from limescale and corrosion. Featuring BPA-free, anti-burst housing and a fast 10 GPM flow rate, it ensures safe, efficient water filtration. Compatible with multiple 3M Aqua-Pure models, each cartridge lasts up to 6 months, delivering reliable, leak-free performance for your home. ## Description desertcart.com: Waterdrop AP431 Replacement Cartridge for Aqua-Pure® AP431, 3 Pack | Water Filter, Replacement Cartridge for Aqua-Pure® AP430SS, Helps Prevent Scale Build Up On Hot Water Heaters and Boilers : Tools & Home Improvement ## 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 | #13,248 in Tools & Home Improvement ( See Top 100 in Tools & Home Improvement ) #90 in Replacement Under-Sink Water Filters | | Brand Name | Waterdrop | | Compatible Water Purifier Models | 3M SF18-S | | Customer Reviews | 4.6 4.6 out of 5 stars (1,090) | | External Testing Certification | RoHS | | Included Components | AP431 Replacement Cartridge*3 | | Item Dimensions D x W x H | 2.56"D x 2.56"W x 9.45"H | | Item Weight | 1.9 pounds | | Manufacturer | Waterdrop | | Manufacturer Part Number | WD-AP431 | | Material Type | Food-grade polyphosphates | | Model Number | WD-W65 | | Number of Items | 3 | | Product Benefits | Inhibits Lime-Scale Growth | | Set Name | Waterdrop AP431 Replacement Cartridge Set | | UPC | 840814177501 | | Unit Count | 3 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 ![AP431 Replacement Cartridge for Aqua-Pure® AP431, 3 Pack | Water Filter, Replacement Cartridge for Aqua-Pure® AP430SS, Helps Prevent Scale Build Up On Hot Water Heaters and Boilers - Image 1](https://m.media-amazon.com/images/I/71r+OcOtWxL.jpg) ## Available Options This product comes in different **Size** options. ## 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 --- ## 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/222482963-ap431-replacement-cartridge-for-aqua-pure-ap431-3-pack-water](https://www.desertcart.us/products/222482963-ap431-replacement-cartridge-for-aqua-pure-ap431-3-pack-water) --- *Product available on Desertcart United States of America* *Store origin: US* *Last updated: 2026-08-24*