I had a pool installed two years ago and had a Raypak natural gas heater installed with it. I noticed it leaking a little a week ago and within a couple of days it was a major leak. The leak is coming from the heat exchanger. My pool guy told me that low pH of the water had destroyed the exchanger. Sadly I will admit that while I did maintain the pH last summer I really did little to maintain it this year. I do know it never got way out of line because I would have noticed it on the test strips. I am just wondering if it is surprising that the exchanger was destroyed so quickly?