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With well water your problem is likely high co2. Are you going through a lot of DI? If this is the case you can process the water through all stages except the DI, then aerate the water with an air pump and airstone to drive off the excess co2. After aerating run the water through the DI.
I would imagine at 600 that that is pretty hard water. Do you have a water softener in the system....that would help with the hardness. Now CO2 is another issue.
112 from a well 293 ft deep in the sour land area of hillsborough. Water testing shows better quality with regards to toxic material than those with city water. Cheers!