For the last 16 days my SWCG system has been shut off (cell died, new system coming) and I've been chlorinating with Clorox. My pH has NOT moved from 7.5 this entire period. That has never happened. I typically have to add about 3 cups of muriatic a week to maintain good pH. This definitely shows how the SWCG affects pH, and it's a bit surprising given my fairly high TA:

Here's the numbers so far:

FC...2.5ppm (using clorox for now)
pH...7.5
CH...(ran out of reagent, so I couldn't test yet---likely around 300-350ppm)
TA...170
CYA...80ppm
Salt...2600ppm currently, but will be raised to 3400ppm this weekend for new SWCG

I'll be adding salt, and knocking down TA this weekend in prep for the pentair IC40. I just did about a 65% drain/refill 3 weeks ago.