We currently bought bottled water due to the awful taste of our water.  My doctor recommended this to me and instructed me to stop using bottled water.  We tested the water with the water meter, it was over 400.  This filter made the water drinkable.  We love it.  The filter usually last a month.  The 30 cup readypour is the right side for our family.  The cost of the replacement filters may seem high but if you consider how much is spent on bottled water and the effects of the heat on the bottled water, it is worth it.  I love the meter, when the water begins to have a taste, I test it and know when I need to change the filter.