The most important thing is to keep the CH level under control. If CH is high, and PH gets high, you can get calcium scaling. Calcium scaling will reduce the efficiency of the SWG cell and if there is too much scaling over a longer period of time it could shorten the cell life.
Also, it is CRITICAL for the CYA to be in the range recommended by your SWG vendor. The consensus on TFP is that you will have trouble maintaining CL if it is too low.
also, non chlorine shock (MPS) is also a source of sufates as is the dry acid (sodium bisulfate) that waste indirectly referred to by saying to use muriatic acid for pH control.
I'm certainly NOT a chemist (but from reading your and Richards posts - I've picked up a little -- I think it was PatL's advice I most remember for this )
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