I think something that has been pointed out but not absorbed.. the chart and equation are for 'perfect' water. If you are one of those people with acidic water (ph well below 7) and you are not injecting CO2.. then you don't have 'well over' 100 ppm co2. you have some other acid in your water.
go to your water source and do a ph test on it.. if it's coming out acidic, then this chart /equation may just be very useless for you.
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