how can you find a slow leak in an above ground pool ?

Answer 1

food coloring!
First find the area where it is damp on the ground around the pool
then in that area of the pool pour the food coloring
you will see movement in the direction of the leak

Answer 2

If it's an above ground pool
The problem is much easier to detect
Just add color dye
You will notice where the leaks are coming from

Answer 3

speaking as a layman, you ought to according to risk line everywhere in the pool with some sand and notice the place the moist spot varieties, and that should provide you a robust theory of the place on the pool to heavily study.