Hi,

Thanks for the replies. It was also suggested to me by a local pool technician that I check with a HVAC company. The local pool companies have not run across this problem, although I was told to try simply running the heater for an extended period of time and that it will burn off the growth. I have not tried that yet but will. I'm a bit skeptical of this suggestion but I guess it's worth a shot.

Best,
Keith