Yes, those are trichlor tabs. You'll do better to put them in a floater, because if you hang them from a sock next to your liner, you're going to get fading of the liner from the acidity of the tabs. Also, I would remove them from the pool while swimming so that you don't accidentally swim into a pocket of concentrated trichlor, which would be very uncomfortable, and possibly damaging, to your eyes.
You did a good thing by testing your pH and adding acid accordingly, not just blindly following the pool store's advice. That's what we're trying to teach people here to do. Good job!
I agree with Carl, though--get some chlorine of some type into that pool ASAP before you end up with an algae bloom!!
Janet
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