28' diameter 54" deep above ground pool.
The bottom half of the wall all the way around the pool has a brown tint/stain. Stain is the same height all the way around, almost like the water was that low. Stain is about 24" above pool floor. Water was not drained that low ever. Stains were there after opening this spring. There are no stains on the pool floor or above the 24". Seems weird how the stain is so defined.
Any help and/or suggestions here?