You can use any form of chlorine that you want but you just don't want to mix them outside of the pool. If this is a freshly filled pool, the reason your chlorine is disappearing so fast is because there is no CYA (stabilizer) in the water. The tablets have CYA in them so if you use them, it will slowly add CYA. What kind of granules do you have? Cal-hypo or Dichlor?
If you have no chlorine in their right now, you need to get some in there before the pool turns green! It doesn't take long!
Is your test kit an OTO/Phenol Red kit (yellow and red drops)? That kit is useful at times, but doesn't give you all the test readings you need. It cannot measure alk or CYA. We suggest the Taylor K-2006 or 2006C that you can get through the testkit link in my signature below. You cannot buy it locally. You may be able to find an HTH 6-Way test kit at Walmart. that would also be ok.
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