Well looks like we have been lied to !! Yes there is no chemical you can put in your pool that will change the water color if you pee in the pool !! So notice the sign around the pool that  say "WELCOME TO OUR OOL NOTICE NO P IN IT LETS KEEP IT THAT WAY" but no one will ever know if ya go, just the water temp just will get raised a bit. 

See Privacy Policy at https://art19.com/privacy and California Privacy Notice at https://art19.com/privacy#do-not-sell-my-info.