Hard water is defined as having high levels of minerals such as magnesium and calcium. The main problem with these minerals is that they can leave behind limescale deposits on kitchenware, faucets, and plumbing fixtures – leading to decreased efficiency over time. Therefore, when choosing a hard water filter for your house UK it’s important to select one that effectively reduces or eliminates these mineral deposits while still providing clean drinking water. A good choice would be an ion exchange softener or descaler; this type of unit works by swapping “hard” ions (such as calcium) with “soft” ones (such as sodium). This process not only eliminates hardness in tap water but also prevents the build-up of unwanted deposits within pipework and appliances – ensuring both comfort and convenience for many years ahead! Additionally, some modern filters come equipped with extra features such as fluoride reduction capabilities – making them ideal for reducing potential health risks associated with excessive fluoride intake from drinking water sources.