You won't do both. Pick one or the other.

For now, add 3 gallons of the 10.5% chlorine. That should take your chlorine up to 25. We want you to test as many times per day as you can, and each time add enough chlorine to get back to 25ppm. Glad you ordered the kit. Good decision. But, for now, go to Walmart, or even to the pool store and buy a cheap OTO/Phenol Red kit (yellow and red drops.) It isn't ideal, but is reliable and will do until you get your kit. It will only test chlorine levels to 5ppm but you can force it to go higher by using a dilution method described here: Testing Without a Good Kit

Only use the LC for now. No more pucks, no dichlor shock powder, no cal-hypo. Just LC.

Let us know which option from my earlier post you pick so we can best advise you.