I started off trying the 10 cup and went on to purchase the 30 cup; that's how good it is. I used the TDS to test the water from the tap, from the filtered of the refrigerator, from the filtered fountain at the office and the results were alarming. The water come out of Zerowater filter shows zero! The water tastes refreshing. I've been drinking more water. And because of this, my health has been better. I even asked the company if they'd consider doing the refrigerator filter version.

Highly recommend this product!