I was required to be on `filtered water only' instruction by my doctor due to an autoimmune condition. After a long research, I narrowed down this product for it's most impurities removed and cost per gallon. It is more than 2 years I have been using this product and I am impressed how it has survived my abuse so far. 

It is convenient to use and replacing the filter is a breeze especially I always keep few in the stock. I wish they offered few drop off location for the recycling of the filters. Their current program for mail-in recycling is not the most favorable to the consumer who purchases the filters from other retailers.