17K gallons? Dump BOTH gallons of bleach in, and then some. Did you get the local OTO kit? With the CYA reading your picture shows (~150 ppm), you'll need to get at or near OTO "orange" to start getting your algae under control.

And yes, if you're pool has been run at low pH for a long time (which tends to happen with trichlor use), that would lead to rough and thin plaster.

Post your COMPLETE test results on the refilled pool. But, when testing the CYA, test a mix of 1/2 pool water and 1/2 tap water. Multiply the result by 2.