TA of 40

Aerating will raise your pH but not change your TA.

What is the TA of your fill water?
 
OK> so I would raise your TA to 70 ppm. With splashout, evaporation, and backwash from your sand filter there is a good chance you will need to add baking soda on occasion. Your pH, though, should be quite stable.
 
I agree mostly with Marty. Yes, raise TA. I'd target 70 and see what it calls for. If it doesn't come out even, round up or down to the closest pound and go buy that much. You might end up at 74, or you might end up at 65. It doesn't matter either way. With the added TA, you pH will come up just a little.
 
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