These arent really valid reasons to go spreading urine over the local baths, but theyre explainations that give a bit more insight into the pool pee-ers mindset. we looked at some samples from some pools in my area to determine how much pee was in them and i conducted an experiment of my own to see what was the cause of that classic pool smell. how to measure how much pee is in your pool - duration 1132. Lets just start with the premise that the next pool you dive into will contain pee. Theres also probably going to be a wee bit of fecal matter, a dollop of human. Urine-indicator dye is a substance which is supposed to be able to react with urine to form a colored cloud in a swimming pool or hot tub, thus indicating the location of people who are urinating while they are in the water. A 2015 report from the national swimming pool foundation called this the most common pool myth of all time, with nearly half of americans surveyed by researchers. These hot spring pools were wonderful! I swam laps in the outdoor large pool which was about 100 degrees. once someone does pee in the pool, the only way to truly get rid of it is to replace the water. Its not uncommon for water in a pool to go unchanged for years, blatchley says,. There is no chemical which changes color when someone urinates in a swimming pool. There are dyes which could cloud, change color, or produce a color in response to urine, but these chemicals would also be activated by other compounds, producing embarrassing false-positives. its a hard truth, but after 20 years studying swimming pool chemistry, ernest blatchley iii, an environmental engineer at purdue university, is willing to tell it like it is people pee in. Inspired designs on t-shirts, posters, stickers, home decor, and more by independent artists and designers from around the world. All orders are custom made and most ship worldwide within 24 hours.