I agree it depends how much water you are losing. If it is a lot then I would maintain FC at 10. If it isn't a lot then I would SLAM. What is a lot? Not sure.
An inch per day? Maybe?
10 days is a long time to be away. If your wife is not able to consistently maintain the SLAM and test FC as required, (if it were me) I would keep things simple for now. Simply ask her to add a routine amount of bleach each day based on typical usage. Show her how to test the basic stuff once a day or so (FC and pH) just to avoid anything major, then hit that SLAM properly when you return. That's just me.![]()
Maybe keep the FC elevated to 8-10 to help start to clear it and still be able to test PH. PH test is good with FC up to 10.