Concentrated leak detection dye from BRIGHT DYES – Division of Kingscote Chemicals, disintegrates rapidly in water and gives vivid, fluorescent color detectable in murky water, sewage or septage. It can be used to identify leaks, infiltration and exfiltration in plumbing connections, validate sanitary and septic hookups and performance, and identify leachfield issues as well as sources of contamination in wells. It is safe, nontoxic, biodegradable and certified by NSF International to ANSI/NSF Standard 60 for use in and around drinking water. It is available in fluorescent yellow/green, red and orange, and nonfluorescent blue, in tablet, liquid or powder form. 800/394-0678; www.brightdyes.com.