Instruct: Classify Amazon reviews into positive or negative sentiment
Query: design flaw

It's a good thing I set this pet water fountain up in the garage because it constantly is forcing water out the back of itself if I use the hookie fabric filter. The filter stops the water from flowing as fast as the pump works. So it forces the water out of itself so you can not use the additional water reservoir if you use the filter. Without using the filter you could clog the pump.