Experts are recommending it, health freaks are swearing by it... what is it that has Kalis Keto taken the world by a storm? Well, it's alkaline water filter! New to limelight, you might have read the term 'ionizer' or 'alkaline water filter' quite a lot of times online. Alkaline water filters are filters that produce water with a pH level greater than 7, i.e. alkaline in nature. This water has been tried and tested in several laboratories and has proven to be beneficial on many fronts, and that's why doctors insist on consuming it on a daily basis.