Using TFP method this year, first time, great results - sparkling clear, no algae, no shocking...easy. (Except for disposing of the empty liquid chlorine jugs.)
But my question is around Calcium Saturation Index. Poolmath is giving me +.41 and I'm getting concerned about damaging the plaster which is already kind of rough.
Using TF100 test kit:
I feel like I should get the PH down to 7.4-ish.
I've put in enough dry acid to do so, but the PH only went down to 7.6, and then back up to 7.8 within a week.
BTW I've owned the pool for two years - there appears to be some calcium scaling through-out the pool (patchy/streaky areas) but it hasn't changed over the past two years (brushing doesn't seem to help.)
Should I be concerned?
Should I try to overshoot the PH down to 7.something?
Should I drain and refill to lower CH? (Expensive - local tap water CH measures 200, so I'd have to truck in water.)
Thanks a lot for any comments!