I've had a leak in my pool for a while, as discussed in this thread. It has been very inconsistent, making it quite difficult to determine the source. It was leaking in the spring, then didn't leak at all for two months, then was leaking somewhat slowly - then last night began leaking at a very fast rate - if it continues for 24 hours, more than 1000gallons/day.
The dye test - with dye or with food coloring in corn syrup - doesn't lead to any evidence around intakes, return, light fixture, ladder, or steps. Nor does there seem to be any evidence around the one noticeable underwater scratch in the liner. Speed of the leak these days seems to be constant, regardless of whether the pump is on or off.
I cannot find any evidence of damp spots down the hill from the pool.
The vinyl liner is 8 years old, and seems in good shape. There is one hole I've noticed above the water line that I've been intending to patch.
As that earlier thread indicates, I have suspected the PVC piping from the bottom drain in the deep end - and at one point thought I had decreased the speed of the leak by putting some plastic over the drain and weighting it down. But I did that again this morning before heading to church, and the rate of water loss did not vary from its rate overnight.
So I am in a quandary, and am anxious to hear some advice.
I presume I need to call in a professional. But, like many of you, I have never used pool professionals since I found poolforum.com and then this site. If any of you would have a suggestion for a professional in the Charlotte or Concord NC areas, I'd be thankful.