Check the listing for details. Waterdrop AP431 Replacement for Aqua-Pure AP431 Hot Water Scale Inhibitor. Color: White, Condition: New. Listed at 23.74 USD. 【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 KW431Product Description Why choose WaterdropPerfectly fits the original with no risk of leaks.Designed to prevent the accumulation of limescale and rust and to protect pipelines.Prolongs the service life of your water-using appliances.Prevents bursting with strong, BPA-free plastic housing.Its consistent flow rate of up to 10 gpm meets your water needs.Optimal performance for six months, depending on water conditions.Waterdrop WD-AP431 Scale Inhibitor CartridgeReplacement models:3M Aqua-Pure AP431, HF8-S, KleenWater KW431.3M Aqua-Pure AP430, AP430SS, and SF18-S Scale Inhibition System.*Please note that this is a compatible spare part and that the manufacturers’ names and part numbers have been used for reference purposes only. Waterdrop is an independent brand.Ensures your water-using appliances last longerExtend the lifespan of your water-using appliances with food-grade polyphosphates, while preventing the accumulation of limescale and corrosion.Perfect designThe precise design ensures a perfect fit with zero leakages. Thanks to the strong, BPA-free plastic housing, bursting and cross-threading are prevented.Consistent flow rateThe stable and fast flow rate of up to 10 gpm provides uninterrupted water for your domestic use.