i see no reason why short term, there'd be an issue with 4600. i wouldn't want to run that all season but..mine is at 3600. i believe the autopilot recommendation is 2500 to 3500..i still have a round of vacuuming and backwashing to do so i'm not going to sweat it. i did some digging..see this. i forgot how high a salt level the autopilots can tolerate!
"AutoPilot Systems do not require a high salt cutoff or warning and can operate satisfactorily at levels up to 35,000 ppm! AutoPilot cells, unlike the others, are not affected by high salt levels. Systems that have a high salt protection cannot handle the high salt and are probably the units that will damage the cell, under these conditions. The reason for protection is that the transformer runs hot with higher salt (greater conductivity) levels. Unless you are sure that you added too much salt, I suggest that you verify that the salt level is where you think it is. Your concern about excessively high salt levels greater than 6,000 PPM, should be directed towards metallic fixtures such as handrails, ladders, light rings, or heat exchangers. Higher salt levels will approach the taste threshold of about 3,500 PPM. To lower the level to 3,000 PPM, you need to pump out about 3,200 gallons of water or drop the level to about 6,966 gallons, taking care not to pump out too much water at a time, as this might cause problems in high water table situations. To avoid the possibility of pools popping up or vinyl liners floating, it may be safest to pump out the water in smaller increments. In either case, replace the pumped out water with fresh water. However, if the taste is not objectionable, the salt level can be left at its current level. It should dissipate, as time goes by, without any damage to equipment. I hope that I have been helpful."
re: your question about salt from other source...i believe that some salt will be in your pool already from chlorine from last season. case in point..i ran 3000 ppm last year (1st year i had an autopilot). i drain at least half my pool for winter. i was pleasantly surprised that my salt level was still at 2400 ppm when in opened this season and filled with water! i took it up 1000ppm using the bleach etc calculator with 2 bags of salt (i had 3 in my garage left over) like i say..i'm at 3600 now.
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