As long as you're paying attention, perhaps you can help with another potential headache.
See the pipe going into the sand after the heater? I'm getting water around it and suspect a fitting is leaking. I'm hopeful the leak is not under the concrete and I can repair it.
If I have a leak under the concrete, is there a method to replace the pipe under the concrete that doesn't involve a concrete saw and a lot of dust (e.g. lining it)?