Our pool is about 5 months old and has a built in spa with an overflow. I run the pump for 4 hours right around 10am - 2 pm. Within the past week or two I've noticed that in the morning, the spa is low by about 2-3 inches. It never got below freezing here, so I don't expect that is it, especially since I figure I'd see a leak above ground.
I assumed that I must be having an issue with a valve or a check valve. However, I have isolated the spa from the pool completely. On the inlet side, there are two vavles that would have to fail. On the outlet side, a check valve, 3 way valve AND a 2 way valve would all have to fail. But the spa still dropped a few inches overnight. So I assumed the leak is in the spa body or the lines going from the spa to the equipment.
Another step I took was that I circulated only the spa water and had all but one spa jet closed so the pressure is around 25 psi on the filter. I figured that if there is a small leak in the return line that it should quicken with the increased pressure. But the spa level did not seem to lower after a couple hours.
My next step is to double check the return line by shutting off all the spa jets and if the water level still drops then I can be certain that the leak is in the drain lines or the body.
Luckily my pool is still in warranty, but I really would like to have some good information to provide the PB so he does not waste weeks trying to find the leak. And I'd like to make sure it is not something simple I've overlooked. In the past two weeks, nothing has really changed. The only thing I did was drain the filter and pump a couple times and opened all the valves when I thought it might get below freezing here, but I can't figure how now that all valves are back to normal this could change things.
Any ideas of what to try next? If I have to plug the drains, I can heat the spa and get in to do that.
Any other advice