Paint exposed metal areas with a heavy-duty bitumen waterproofing membrane. Ensure proper drainage around the pool by using a slope in the backfill material to direct water away from the shell. Consult the in ground install guide or engneering documentaion for specifics.
How hot can you heat the pool too?
Essentially to 38°. However achieving this is very dependent on factors such as ambient air temperature, cover, location of Equipment.