Check the listing for details. Leak Detecting Dye Tablets for Toilet Tanks 2 Pack. Condition: New. Listed at 4.99 USD. View more great items Product Description: Toilet Leak Dye Tablets, Water leak detection dye tablets. Water Leak Detection Dye Tablets. Find your leak with a non-toxic, non-staining leak detecting dye tablet! Use Water Leak Detection Dye Tablets to identify leaks in your toilet tank that can waste thousands of gallons of water annually. Damaged, old & worn and poorly made toilet flappers can leak undetected allowing water to continuously flow down the drain. Water Leak Detection Dye Tablets, when placed in the toilet tank, dissolve, turning the water blue. If blue water appears in the bowl, your toilet is leaking – you have a leaky flapper that needs to be replaced. The Leak Detection Dye Tablets are packaged 2 per bag. Non-toxic, non-staining and effervescent. Leak Detection Dye Tablets are a low cost water saving product and make a great addition in water conservation kits. On Jan-18-18 at 14:55:33 PST, seller added the following information: