Finally got borates in my pool last weekend, now I am pretty sure the pool is leaking somewhere. Murphy's law??? Here is what I have done so far, with the pump running I have lost about an inch in a 12 hr period without it running I have also lost about an inch in a 12 hr period. So can assume it is not in the pressure side? I have an auto cover and pool has been covered in this 24 hr period. Should be able to eliminate evaporation correct? I have marked the water level again and have capped the return lines. I will see in the next 12 hrs how much water if lost. If it goes down the same I will put the aqua doors on the skimmers to eliminate the skimmers. I used a bottle of phenol red and went around and inside the skimmers, around the returns, around the steps, and around the light fixture. Could not see anywhere where the dye was being sucked in by a leak. As I was looking into one skimmer I could see on the elbow at the bottom what possibly looked like a hairline crack. Could not tell for sure though. I have not noticed air bubbles in the pump basket and it does not lose prime, pump runs 24hrs/day, so am I safe to say its not in the suction side?
I guess I am going to see if in the next 12 hrs what the water level does. Am I on the right track at eliminating the returns, the skimmer( suction) lines, and lastly the vinyl liner?
Thanks for any advice,