Oddly, my pool's pH read 7.4 today -- same as it was three days ago! While I haven't been using the waterfall, I've never had the pH be stable for three days in a row. Weird! Pool temp is 79, no change there. Does calcium somehow stabilize pH, too?

My FC hit 4.5 today, so I'll readjust the SWCG back to its original setting (50%) and see if the FC stays the same.