Correction to my last post on the test readings.

Question at the bottom...
Tested CL tonight and I get 4.5, down from last nights 11. Here are all of the numbers.

FC- 4.5
CC- 0
TC- 4.5
PH- 7.4
TA- 190
CH- 140
CYA-150+

Sunny hot day, cover off. No swimmers, the dog did make it in and right out a couple of times but no duration of time in the water (He's also primarily an indoor dog).

As a reminder the numbers above have been pretty steady outside of the Chlorine. Last night CL measured 11

Question?
Does this drop in Chlorine, 6.5 points, seem reasonable? I tested once FAS-DPD then twice at varying multiples using DPD and the number seems correct.

If so, my plan is to add 2.5 gal of 6% bleach to get it back to a little over 10ppm.

Suggestions?