I've had my 30 cup pitcher for almost 2 years now. I live with municipal water in Virginia, and don't want to drink all the chlorine, flouride, agrochemicals, and other contaminants in the water. Our tap water comes out at about 170-220ppm (Total dissolved solids- including all aforementioned and more), and comes out of our zerowater filter at 000ppm. Once the filter gets to 006, you should replace it. If you keep it too long, it produces anions which smell fishy. Safe to drink, but not pleasant- good for watering plants. The water tastes fantastic, no plastic taste, chemical taste, or anything like the tap. Rest assured that you're getting clean, chemical free water affordably without single use plastic waste. 
After nearly 2 years, the pitcher is doing fine, except the finger hold tabs have broken off of the dispenser spout.
Highly recommend the Zerowater filters. They're Excellent.