I'm so glad that I bought ZEROWATER since the area I live in currently has really high TDS. It is helpful to have the free water quality meter to know what the TDS is in the water before and after it is filtered. I wanted to have clean water so I bought the 6 cup pitcher and it made the water taste SO much better. The only down side is that I have to buy a replacement filter almost once a month. But it makes it worth it to have cleaner water to drink. I have bout the package of 4 filters so that I have backups, the package weighs 5 pounds.