We converted our 18'x52" above ground pool 3 years ago. Last year I noticed the top rails were rusting. This year it's worse. Our deck hangs over the part of the rail were its rusted. Was it a bad idea to have done this? Did I void the warranty? How can I change it back without empty the pool? Also I've had replace the bearings in the pump 2 times since I've had the pool. Is the salt affecting that too?