Aqua Optima uses a unique patented 5-step filtration system to ensure impurities are removed from your water. It does however allow the beneficial elements to flow straight through such as fluoride, potassium and magnesium - all vital to the proper functioning of our bodies. Its fast flow technology means you can use the Aqua Optima water filter in a water filter kettle to filter and boil your water simultaneously – so no more waiting around for your cup of tea!