I would guess they dyed the water on the other side to check where the water that is coming through is coming from. It proves that the extra flow is coming from the other side of the colvert.
I was a sewer rat for years ran a camel super200 ,Vac Con ect. and the only thing that takes that dye off is time. I had this one kid on my crew that was an arrogant prick, as the supervisor I would go ahead and get the rooms at motel for the crew. Scott was his name , anyway I put 2 dye tabs in the shower head and after a long day of cleaning pipe we went out and had a few beers he hopped in the shower and the next morning he was a neon green,. Myself and the rest of the crew laughed our asses off he was pissed. That was 20+ years ago and I'm still laughing.. Just remember shit runs downhill payday's are on Friday and don't bite your fingernails.
I must say, I enjoyed that. Thank you for sharing. It`s interesting and refreshing to see how things get used for the good instead of hearing all the bad.
Will do next time I get opportunity. Its has two rear facing jets which makes.the jet spin and one forward jet slightly offset which cuts at the front.
