Is constantly adding muriatic acid bad

Run a full set of tests and plug your numbers into PoolMath. Look at the CSI number. You should see it between -0.3 and +0.3 Keeping the pH in range is great (and necessary to prevent damage to heaters and such) but the other parameters can also affect things and make the water damage the plaster. See what raising and lowering pH, TA, CH, even temperature does to the CSI. You may find you need to raise TA or CH or keep the pH at the upper end of the swimmable range to prevent damage.
 
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