Recent studies by leading universities have shown that up to 10% of pool water is actually urine. Though this can reduce your water bill in drought states, most people find this fact disturbing. So do wee.
Which is why the wizards at ConnectedYard are proud to introduce a brand new type of water sensor: The Weemeter. By measuring the exact PeePeeMs of urine in your water, you can choose when it's foul enough for a water change.
Enjoy your pool, and relieve yourself.