Thank you so much Ben! I bought a HTH 6 way test kit as you recommended. Testing results are as follows:
Tot. Chlorine: 10
Free Chlorine: 0 (from Aquarius)
pH: 7.8
Tot. Alkalinity: 173
Tot. Hardness: 181

According to your explanation, I don't think my pool has ammonia. Therefore, breakpoint chlorination would be a bad idea. I trust you.

Now, please teach me what should I do next? Should I put one jug (96oz) of 6% bleech 96oz into the pool as suggested by the pool calculator? How can I raise my free chlorine?

Thank you again?

James