I think I have a leak somewhere in the return line.
So my system consists of a IG pool with a sand filter. One skimmer and two returns. There is a grid in the bottom but it's plugged (never used i guess). It came with a house i bought a year and a half ago.
I loose maybe 2 or 3 inches overnight only when the filter is running and nothing is coming from the drain. From my farthest return i can sometimes see a few small bubbles coming out every few minutes or so. Absolutely no bubble coming out from the first one though.
So my guess from what I could read here is that I have a leak in the return line probably between the 2 returns.
Any advice on how I could fix this? Should I try to use a small pipe camera to see where is the leal exactly?