Been doing the "Bucket test" and it seem like I lose 1/2 inch in the pool and only 1/4 of an inch in the bucket. But here is the interesting part, I only lose water overnight.
I filled up the pool to were i wanted and marked it 9AM in the morning. I left the pump on for 5 hours and turned off it. No water loss (2PM). at 8PM i checked the level and no water loss. 9AM the next morning 1/2 inch water loss.
Next morning I did the same thing and filled it up to the point it should be but did not start the pump. All day again NO water loss my last check was at 930PM (12 hours) no water loss. The next morning exactly the same amount 1/2 inch.
We had a heat wave where it went to 104 degrees for about 3 to 4 days and my pool temp raised to about 85 degrees. These last few days the temp has been around 85 to 90 outside and dropping to low 70's at night. I have heard that sudden drops in temp when the pool is warm can cause massive evaporation at night. Not really sure about this.
I can say that the bucket never seems to lose much water. I have found 3 giant holes in the liner that I patched well before any of this started. No air bubbles, no losing prime.
I don't have any dye that I can check the patching with. Would a grocery store or Home depot place have something I can use? I tried the PH drops but they don't last long in the water. I tired to place them as close to the holes i patched and they don't really move much.
The only thing that is odd is the water loss only overnight and not during the day. If it was a hole that I failed to find/patch right I would think I'd lose water during the day as well.