Yup... the more often you do it (even up to hourly!) the faster you'll get thru this.
Your original pH must have been pretty high. You can test FC every hour and add chlorine as needed until bedtime.
Just saw your update. A couple of things come to mind. First, in PoolMath, did you adjust the percent chlorine on the right to the correct strength? Also, is the depth of the water in your pool 4' or is that the wall height?
Either way, it is not a huge problem; we just may have to zero in on something. No worries.
Now that your FC has dropped back down closer to your SLAM level, check your FC every couple hours or so if you are available to do so. As for the bleach, not sure if it was understood ..... but on the Poolmath calculator, there's a block in the middle of the "FC" row that shows the current percentage (WEIGHT) of the bleach. By default the program may show 6 (for 6%). So if you are using a stronger percentage bleach (i.e. 8.25, 10, etc), make sure to manually change that number when you are calculating for your FC to add.
You got it Staci. Maintain that FC of 28 as consistently as you can. That's the key. Brushing - yes, and of course backwash if you see your pressure gauge increase by about 25%. It's not an overnight process, but it works well. If after a couple days you don't continue to see progress, you might consider doing another CYA test just to make sure you're at the right FC SLAM/shock level. If you have anymore questions, just let us know. Have a nice day.
Is 4' wall height or water height. Makes a difference.
Gauge is broken (is it a necessity?)...my husband has been checking by feeling if the flow is not as strong as suggested by prior owner. Can a new gauge be purchased at a Home Depot or Lowes?