I have a question about my heat exchanger. I have a hayward 350000 heater which is natural gas. I had to disconnect it because it was beyond leaking, it literally flooded my neighbors back yard when i caught it. The pool company told me that the heat exchanger is bad and must be replaced. At the time i did not understand the importance of water chemistry which I do now. Is there any to fix this(like fixing a car radiator)? I dont want to spend $900.00 or more to replace this. If the hole is not too bad can it be repaired? I havent torn down the unit to look into the problem. I will be doing this soon.