The pool was drained little over 2 month ago. When I was cleaning the pool using a pressure washer, I noticed several discoloration around the hairline cracks that I wasn't aware of when it had the water. One of the hairline crack on the wall of the pool had white powder substance (almost like white powder on car battery) covering the crack. When I washed it I saw the crack and the surrounding was little darker with green tint to it. Exact same type of powder and discoloration was on the floor in one another spot. Both of these was about 12 inches in length. The other very small cracks that caught my eyes were about 2 inches in length. These didn't have the white powder substance but it caught my eyes because of slight discoloration. I did not notice any of these hairline cracks when the water was full.
Are these cracks going to leak water when i fill it back up? What is the white powder on top of the cracks? I didn't have any leak before so I am not sure how these will turn out when water is added.
here are some pictures after cleaning with pressure washer.