Green Tracing Dye - Highly Visible Concentrated Fluorescent Leak Detection Dye - 1 Gallon

Still havent found the drains. It does stain heavily so be careful not to spill or get it on your hands. Takes a long time to wear off! May work better for othera needs not so much for ours. We wanted to know wherw are down spouts and floor drains led and.atill no.clue.

A little goes a long way, and this stuff does show with UV light as advertised.

I used this product to track down a leak in my lawn sprinkler system and it only took about 10 minutes to track down the problem and replace the broken pipe. I would recommend this product. It did the job and didnt kill any plants or grass.

Just what I needed .