Was losing close to an inch of water a day with the pump running. Finally got around to doing a pressure test, found large leak at the return jet joint. Instead of digging and breaking concrete I opted to try this plug. So far after a week I have not lost any water and you couldn’t tell it’s a different jet. I will eventually replace pipe and jet but for now this saved me lots of time and headache. Would totally recommend. We will see how it hold up to Canadian winters however.