Baloney!! Bleach is 6% sodium hypochlorite. How come that would void the warranty if their pool store liquid chlorine which is either 10 or 12.5% sodium hypochlorite won't? Just more evidence that the pool store doesn't know what they are talking about.

Test your pH and post the reading.

I'm guessing your volume to be around 9700 gallons. Go ahead and add a 3-qt. jug of plain bleach slowly to the skimmer while the pump is running. That will take your chlorine up to about 4.6ppm. Until you get some CYA in there, you'll need to test at least morning and evening and even in the afternoon if you are home, and each time add enough bleach to get back to around 5ppm. For reference, in your pool, each quart of 6% bleach will add about 1.5ppm of chlorine.

You still haven't given the ingredients of the items requested in the above posts. We need to know to be able to advise you. You need CYA (stabilizer). You still haven't told us what the ingredients are in the tabs and enhancement sticks, so I can't recommend that you use the sticks to add CYA because they could have something else in them as well.