Instruct: Classify Amazon reviews into positive or negative sentiment
Query: Not as good as others say

I bought this for my dorm because I hoped it would give me cleaner water than the tap from the fountains. I followed all the instructions like soaking the filter and washing out the container, however, when I filled up the container with water the black granules appeared at the bottom. I thought it was just because I didn't wash it well the first time so I poured it out and tried another batch. The second time even MORE granules appeared at the bottom. I am very disappointed in the quality of this product and I do not recommend this to people who want clean filtered water.