My understanding is that the efficiency of the salt cell has a non-linear relationship with the amount of salt in the pool meaning that below a certain low level the efficiency (from conductivity) drops off fairly rapidly and the salt cell could shut down (i.e. not produce any chlorine). Also, unless your pool is covered to keep out winter rains, it will likely get diluted which would further lower your salt level. So if you plan on maintaining a low chlorine level using the SWG, then I'd recommend bringing the salt up closer to the recommended level. On the other hand, you could just shock with liquid chlorine and cover your pool which should have this last for quite a long time (probably at least a month before you need to check the level and possibly add more chlorine) and not need the SWG at all. In my own pool with a cover and no SWG, I only lost around 0.5 ppm of chlorine per week, but every pool is different.
Richard
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