Are there any side effects with alkaline water?

I am not convinced that Alkaline water is as good for you as the manufacturers of the machines would lead you to believe. I have been struggling with sore muscles and joints for several months - now worsening to the point of not being able to walk properly. The only thing we have changed is when we hooked up and started using a Varunizer (alkaline water machine). Has anyone else had similar experiences?