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💧 Keep your water flowing smooth and your appliances thriving—because scale is so last season!
The Waterdrop AP431 Replacement Cartridge is a premium scale inhibitor designed to protect water-using appliances by preventing corrosion and limescale buildup. Featuring BPA-free, anti-burst housing and delivering a fast flow rate of up to 10 GPM, it ensures safe, efficient water filtration. Compatible with multiple 3M Aqua-Pure models, this cartridge offers a reliable 6-month lifespan for consistent performance and peace of mind.

| ASIN | B089W9TSJG |
| Best Sellers Rank | #15,977 in Tools & Home Improvement ( See Top 100 in Tools & Home Improvement ) #107 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 (1,116) |
| 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 Highlight | Hot Water Scale Inhibitor for Aqua-Pure® AP430SS, Prevent Scale Accumulation and Protect Water Heaters |
| Item Weight | 16 ounces |
| Manufacturer | Waterdrop |
| Manufacturer Part Number | WD-AP431 |
| Material Type | food-grade polyphosphates |
| Model Number | WD-W65 |
| Number of Items | 1 |
| Number of Packs | 1 |
| Product Benefits | Inhibits Lime-Scale Growth |
| Set Name | Aqua-Pure AP431 |
| UPC | 840814177495 |
| Unit Count | 1 Count |
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