I must say that I am one of those people who love blue toilet water. There, I have confessed. An upside to this obsession is that cleaning the toilet is a simple task in my house. I owe that all to Vanish drop-ins. Recently they have added the scrubbing bubbles to this product for an even more effective product. In the box you get two tablets. You only use one at a time. After cleaning your toilet you flush the toilet and drop in the tablet into your tank while the water is still low. Wait about ten minuets before flushing again and now walla you have blue water. I have found Vanish to be the most effective toilet water tablet. Others either don't last at promised or crumble apart and then instead of blue water you get water with blue floaties in it...YUCK. A helpful hint* Do not completely unwrap the tablet. Open it at one end and let it slide out of the wrapper into your tank. This way you never actually touch the tablet itself. Although it smells nice you do not want to get this near your eyes or mouth as it is a chemical based product. I choose Vanish also because it is not harmful to children, pets, or my septic system. The scrubbing bubbles help keep my bowl stain free. The tablets clean with every flush and give a slight refreshing fragrance into your bathroom. Best of all my water is blue!