I was a Zero Water customer for the last 9 years and I recently switched to Waterdrop's gravity filter system. After using Waterdrop for the last month, I have to say, I'm disappointed with the taste of the water vs Zero. Zero always tasted clean and pure, but there's a noticeable taste associated with Waterdrop. The TDS of Waterdrop vs my tap water is nearly identical, while I was always able to achieve a 0 reading with Zero. With that said, I do like the increased 2gallon capacity of my Waterdrop vs Zero so I don't need to fill it as regularly for two people. Overall, I'll continue to try it for the next few months but I much rather prefer the Zero water taste.