Usually the shaking for two parts is related to temp issues for cold temps. If you are keeping it at room temp especially in Fl you will should be fine. Since you are asking about just the alk I would ask are you having an issue with your alk. If so I would ask if you are testing your newly made salt that you are using for a water change? Different brands of salts mix have a different chemical make up. I have seen some salts mix with a 3.5 meq/L alk, 1050 magnesium and 350 ppm calcium were a another companies mixes at 550 ppm calcium, 1500ppm mag and 2.5 meq/L alk.