DH and I are potentially looking at a new house with an in ground pool. I'm going on my third summer with an AG 15 x 30 pool so I'm feeling pretty confident that I can handle this in ground with the BBB method, it hasn't failed me yet so far!
The pool is a typical 20x40 liner pool, 3 ft on the shallow, 8 ft or so on the deep end, the typical pool you will find at most houses. The water is nice and clear and they have the pump running 24/7 right now (the house is already empty) and everything looks like it is in decent condition but I saw a weird stain in the liner.
Attached is an image. Its a slightly discolored section and the liner is very wrinkly there, any idea what it is?
(The darker blue spots are just a shadow from a tree, it was about 8 in the morning when I was out there taking pictures. The spot is in the center of the image)