Introducing the new super boosted filter with advanced reduction of limescale build-up as well as effective reduction of Chlorine, heavy metals, Lead, Copper, and some sediments. Australian household mains water is strictly controlled, however limescale buildup is a prevalent issue for those living in moderate to hard water areas. Hard water refers to water which contains a high mineral count and occurs when water passes through soft rocks like chalk or limestone and picking up the minerals from them. Whilst this isn't harmful to our health, hard water often results in the unpleasant smell, taste and mouthfeel when drinking. Furthermore, the MAXTRA+ filter also contains a finer mesh for improved reduction of rough particles and a finer cartridge grid which effectively controls the exit of fine particles. For optimum results, we recommend replacing your MAXTRA+ filter every 150L or 4 weeks based on average household size drinking 8 glasses per day (click here for more details). 30 Day Money Back Guarantee We offer 30 Day Money Back Guarantee on all of our products, so if you are not completely satisfied, simply return within 30 days and we?ll give your money back. *vs the standard MAXTRA+ filter