Welcome to our forum.
No, I don't think PH being in the 6.6 range for a week will eat a heater up.
I would agree, especially on a newer tub. 8-)
Are the pipes in your house copper and could your tap water Ph be low? do you ever see green in your sinks or bath tub around the drain? Acid water can eat the copper from the pipes. I wonder though if it would be enough to cause what you are experiencing. :-/
It was suggested to me that electrolosis (sp?) of the pipes can cause the pipes to errode too.
Hey Chad I just called Jacuzzi tech. And like I thought the element itself is stainless steel, he doubted there was any kind of copper in there at all as far as wiring holding the element in place. I really am starting to think its partly the nat 2 and something else causing it?? If your heater is falling apart from the inside, (first I would have ever seen from laing) it will start tripping the breaker pretty quick, I would think.