Easily check toilets for silent leaks that can waste thousands of galleons of water with our handy Blue Streak dye tablets. This bulk pack is ideal for plumbers, janitors, and hotel maintenance engineers. To use, simply place a tablet into the tank. If a blue color appears in the bowl after a few minutes, you have a leak and repairs should be made. By catching leaks, you can save on water and sewer costs. Perfect for plumbers, property managers, hotel maintenance engineers, janitors, and anyone else responsible for large numbers of toilets. Our tablets are safe and made with non-toxic FD&C blue food coloring. Brilliant Blue Dye Leak Detection Tablets are a highly potent dye tablet for use in tracing water leaks, following water lines, examining water currents, etc.