And that's actually what I've been doing, BigDave. For my salt system, the manufacturer's ideal range is between 3.0 and 3.5 (it functions between 2.0 and 4.0). When I see the salt reading on the unit is 3.0, I dump a 40lb bag of salt in the pool, and it bumps it up to about 3.4 (the readings can vary, but that's about right). At that time, I do generally check CYA and it may be under 50, so I'll add CYA to bump it up, hopefully, to around 80. I haven't ever done the math to figure out how much CYA I'd need to add to make a +10 movement in the CYA reading, but since I just added a 40lb bag of salt, I'll try to add 1.5lbs of CYA, roughly (I don't measure, just go my product level in the 5lbs container it comes in).