Instruct: Classify Amazon reviews into positive or negative sentiment
Query: Worthless

When I moved into my new apt the filter needed to be replaced so I bought this twin pack. They are worthless. I followed the instructions for installation and flushing. Not only does the water dispense at a painfully slow pace but it actually raises the parts per million from 255(tap) to 350. While I couldn't tell if the "filtered" water tasted any worse than the tap water it certainly didn't taste any better.I'll stick to my Zero Water pitcher.