PoolDoc / Watermom - Thanks for your help!

An update from my side. I was away for the last week due to my baby boy being born but am back now working on my pool.
I purchased HTH 6-way kit from WalMart. My orginal numbers were as follows:
TC 2-4
PH seemed to be lower than 6.8
AK 30
Hardness 210

on 6/3 I added some left over Soda Ash from last year.

Retested TC and PH today (6/5 morning). Results were:
TC less than .5 (probably 0 if I had to guess)
PH is now 7.5.

Chlorinater is set to FULL. Pool runs about 12 hr/day. So chlorine is still an issue. I was surprised when the original number was higher, but now is back to 0.
Pool is around 30,000 gallons with DE filter.

Would the next step be to add one gallon of plain bleach for EACH 10K gallon? Should i consider some kind of stabilizer?

Also, how to identify PLAIN bleach?