I also have a Goldline swg and I try to keep my numbers such that the saturation index is close to zero. This is where the numbers come from in the goldline book. If you let the SI get too high, scaling occurs on the cell. If the SI gets too low then is starts to dissolve the plates in the SWG and shortens the life of the cell. I have had mine about 9 months now and by keeping the SI close to 0, I have managed to keep the cell pretty clean.
Here is a good online calculator for SI: http://www.advancedh2o.com/technical.../langlier.html
or just use the table in the Goldline manual. Good luck!
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