Pressure question

[MYLIF34GOD]

So I bought a home with a pool and realized real quick there were some problems with leaks, I dove in and did the dye test around the pool light and fixed it pretty easily. Then i realized the only jet in the pool didnt have a cover and quickly found another leak around it, so i patched her up with flex seal and a puddy knife and now its not leaking. I did the dye test around the drain and found nothing. I did the dye test in the skimmer and found nothing as well. I replaced the pressure gauge and put new glass sand in the filter and put better couplings on the piping going to the filter. I have a 10,000 gal inground pool. I have read that an average pool evaporation rate is normally 1/4 inch a day. I feel as if my rate is more like 1/2 inch a day. Granted I live in west texas with 100 plus degree weather every day. The big question I have is the other day i was messing with the valves and i turned the skimmer valve on and my drain valve off and the pressure dropped from 15 to 5psi, what does this mean?
my normal pressure with everything on is 15psi.

 

[Bperry]

So I bought a home with a pool and realized real quick there were some problems with leaks, I dove in and did the dye test around the pool light and fixed it pretty easily. Then i realized the only jet in the pool didnt have a cover and quickly found another leak around it, so i patched her up with flex seal and a puddy knife and now its not leaking. I did the dye test around the drain and found nothing. I did the dye test in the skimmer and found nothing as well. I replaced the pressure gauge and put new glass sand in the filter and put better couplings on the piping going to the filter. I have a 10,000 gal inground pool. I have read that an average pool evaporation rate is normally 1/4 inch a day. I feel as if my rate is more like 1/2 inch a day. Granted I live in west texas with 100 plus degree weather every day. The big question I have is the other day i was messing with the valves and i turned the skimmer valve off and my pressure dropped from 15 to 5psi, does that mean there is a leak in the drain pipe somewhere? my normal pressure with everything on is 15psi. I tried it with the drain off and the skimmer only on and the pressure remained at 15psi. any help would be appreciated.

Do a bucket test to see if there really is a leak or if it’s just feelings.