above ground installation

Hey guys, wondering if anyone can weigh in on a couple of pools. I currently have a 30ft round pool with resin components from Family Leisure. I switched from their permasalt system after one season and went to a SWG. The pool is only 6 years old and has a rust spot all the way through it...

Hello! This month, we installed a new above-ground pool and discovered a 3-foot squared-off ledge (about 1/4 inch deep) along with a few sharp rocks under the pool liner. I'm concerned that this might reduce the liner's lifespan. Should I contact the installer, or is this a common issue...