We love our ZeroWater filter because it removes such a high percentage of potential toxins from our water.  If you are dealing with autoimmune disease or other medical conditions which could be significantly affected by dissolved solids at levels permitted by your water supplier, ZeroWater could be a lifesaver.  At the very least, it provides more peace of mind.

In addition, the water tastes clean and pure.  It's hard to go back to the subtle chemical taste of tap water after drinking such clean water.

The water testers which come with ZeroWater filters are a strong selling point, because they provide some level of objectivity regarding the filters' effectiveness.  We have noticed that not all ZeroWater testers produce the same readings from the same water, but the margin of error is not large enough to make us doubt the filters' effectiveness.