So, having decided to go out and buy one, or by browsing the internet what should you keep in mind when you compare water treatment systems? Surprisingly quite a few things spring to mind and this article will investigate briefly some of the most important pieces of advice. Price is of course a big determining factor but the final costs may be harder to uncover as some systems may appear well priced but require installing, servicing and maintaining which if you can't do yourself easily, will have to be paid for.