Easy to use, just set it inside the bowl and forget about it. Keeps the water in bowl blue and everytime you flush it helps clean the bowl. When I do physcially clean the bowl with a brush it's so much easier and it's not dirty with stuff on it since the constant blue water has helped the bowl clean. Note if you have a newer toliet with the 2 push buttons (1/2 strenght vs full strenght flush) you will need to put a wire hanger inside the tank to hook this bottle to so that is sits low enough in the tank to allow the blue liquid to seep into the water since those toliets use less water then normal. Careful NOT to stain your floor when adding one of these. The blue dye is hard to get off walls, floor if you spill it.

Lasts longer than those tablets for a lot less money too. But they never empty out all the way. So when it seems to have quit I take it and dunk it in and out of the water till it is empty. Don't get it on your skin or you'll turn into a Smurf.