You can see the white filter get darker and darker as it filter impurities. So it works, BUT the spray is so strong that water bounces off the sink onto the countertop. That's it.. spray. There's no regular water flow. And every few days, 1 or more of the spray holes will get clogged (with what, I don't know. I couldn't see anything in my tap water that would clog it) and that one hole would spray out to the side, further wetting down my countertop. Also, I have well water which recently had to be treated with chlorine, due to a bacteria, and this filter didn't reduce the chlorine smell a bit. I ended up ordering a different filter and threw this one in the garbage.