Since taming the swamp two years ago, almost to the day, I had always fought with a scale I couldn't get rid of. pH was high as was CH. Toward the end of last year, I finally got the gumption to dump acid in the pool and got the pH down and the scale magically went away. Winterized by shocking hard and opened to a beautiful clear pool.
The pool was nearly "full" when opening due to over 10" of rain over the winter months.
Since opening, I've had very low TA and pH. Now have TA up to 80 (added more soda this morning) and pH in the 7.2-7.4 range. Using Bleach to maintain (or try) to maintain TC of about 6 (worried about going too high due to new pool heater and apparent bleaching of deep end of liner).
But, my CH has gone almost completely away. The only reason I can think of is rain and having to drop the water, and not having to use much, if any, of my source well water, which is very hard.
What I can't tell is if I need to try to raise it. Have a vinyl liner, so not terribly worried about that, but worried about the heater and pumps, etc.
Results this morning
TA 80 (added baking soda)
TC-2 (added bleach)
CYA about 70 (will keep working to get this down as we've gone completely puck free now, had been using a hybrid of pucks and liquid chlorine from Menards)
Do I want to deal with adding calcium, or rely on evaporation and water replacement with hard water?