We converted from Baquacil to a SWG system in May of 2011 and are very pleased with the results. I have been watching for any corrosion issues and until recently there were none. One of our pumps includes a loop system to the solar domestic hot water system in the garage so we can extract excess heat from that system. It has what is called a Stainless Steel, Copper Brazed Plate Heat Exchanger that the pool water passes through for heat extraction. Unfortunately it has corroded from the salty pool water which surprised me. I thought 316 stainless and copper would not corrode. I now have to replace it with a titanium heat exchanger.
This brings me to my question: is the pool water corroding the inside of my copper pipe leading to and from that heat exchanger? I am also concerned about corrosion inside the cast iron heat exchanger inside my gas pool heater as well. I have not installed a sacrificial anode to the system because I do not have any aluminum touching the pool water.
I will be able to see the inside of the copper pipe when I re-plumb the new exchanger. I can also disconnect the pvc pipe from the heater input and look inside the boiler if necessary.
Any opinions on this issue?