Instruct: Classify Amazon reviews into positive or negative sentiment
Query: Outstanding, but one improvement is needed

Ours lasted about 15 months before it sprang a tiny leak on top of the unit that caused big cascades of water to fly all over the kitchen. And that's not the improvement I'm talking about. For all I know someone in my family conked it with a frying pan to cause that crack. Nope, I'm talking about the little metal knob you have to push and pull to toggle the water through the filter. The problem is the little metal knob has screw threads. It's attached by them, and every time you push or pull that thing it gets looser, eventually falling off (several times per week) and, usually, going down into the garbage disposal. I've got huge hands and I can't reach in there, so I have to wait for my wife to come home before I dare turn on the disposal. That seems like a bad design element on an otherwise pretty great filter. If anyone from the company reads these comments, maybe scribble that down and put it in the suggestion box. Thank you.