In the pictures, it looks like there is no deck and the pool is out of the ground some.
If that's the case, it looks like you should be able to get access to the back of the steel walls.
If you can get access to the back of the steel walls, I think that it would be helpful to get some zinc anodes and attach one to each wall.
A 1 or 2 pound zinc anode on or near each wall connected to each wall would probably help reduce the amount of corrosion over the next 10 to 20 years.
If that's the case, it looks like you should be able to get access to the back of the steel walls.
If you can get access to the back of the steel walls, I think that it would be helpful to get some zinc anodes and attach one to each wall.
A 1 or 2 pound zinc anode on or near each wall connected to each wall would probably help reduce the amount of corrosion over the next 10 to 20 years.