Walmart Ultra Bleach is 8.25%. The label is small and on the front by the UPC label. That bleach is fine as long as it is not scented bleach. I have started to purchase my bleach by the case from Fleet Farm up here. 4 gallons for $9.95 a case with 12.5 concentration levels.
Also, I do have a liner in ground pool so to get our the wrinkles is difficult at times. With your pool, you have to be sure the liner is not old as if you can sometimes cause more damage than its worth. Filling it up full and then take a toilet plunger to move the wrinkles around works great and you should be able to do that with this size of pool.
Go to pool school and continue to read up on proper maintaining your pool with back washing and vacuum to waste if you have a sand filter. Is your filter sand or what kind is it? If it is cartridge, then just clean the cartridge more often. When you vacuum, do it on waste so that all the little piles of dead algae are flushed out of your system. I rarely use filter when cleaning my pool. I have good water and its cheap so its easier to vacuum on waste and replace the water. Plus it helps monitor and control your CYA levels. Learn the different types of chlorine and how each of them can be used to put in CYA at the proper times of the year. I use pucks and chlorine in the spring to add CYA to my pool and once my level is good, I switch to full bleach.
Sounds like you are getting the hang of it. Keep it up and have POP as this stuff doesn't come to you overnight. The TF100 kit that Dave sells on here is sweet and I rarely ever use the pool company except to help in a repair or update to my pool. That's it.
Good luck and keep it up. More pics with your progress would be good too.
Chad