We live in Georgia and don’t “close” our pool. We do have a heater but don’t routinely swim in the winter. We have a salt water pool via SWG. Once the water gets below 50*, the SWG quits production (or conversion) of the salt. So is it necessary to keep the salt level up incrementally (a bag or two a month) when no one is using (swimming) in the winter? Or just wait until the Spring and put 8-10 bags in at once?