My pool is a few months old and the CH has been steadily increasing - probably due to the new plaster - right? Anyway, it seems to have settled at 420. Assuming it will eventually stop curing, what else can make CH rise?
Using the poolcalculator, my CSI is -.2, so I'm still in the safe zone.
Should I replace water immediately to lower CH, or can I wait for evaporation and rains to naturally replace it?