Instruct: Classify Amazon reviews into positive or negative sentiment
Query: Coffee weak and watered-down

I have done a lot of experimenting with this reusable filter, but have been unsuccessful in duplicating the performance of the disposable K-cups with it. The lid of this filter does not have a rubber or silicon seal, so once it fills up, there is nothing to keep the water from overflowing and dripping out the top (around the rim) into your cup. You end up with very weak and watered-down coffee. Using a coarser grind (like that for a French press) alleviates the dripping problem, but then the water flows through the coffee so quickly that it again ends up very weak and watery. Using a darker roast makes no difference. Don't waste your money on this filter -- try one of the other, better-rated brands (like ekobrew) instead.