Added 2 gallons of chlorine and cup of muriatic acid, went to pool store and -sigh- here are my numbers:

CC - 0.0
FC - 5.0
TC - 5.0
PH - 7.8
TOT ALK - 90
CALCIUM HARDNESS - 275
STABILIZER - 100
TOTAL DISSOLVED SOLIDS - 900

I guess my question is how can I see numbers jump around like this AND pH go up? Is it just tester error at the pool store? I really cannot wait for the Taylor test kit to show up. Hopefully it just needs to settle down but I don't get why the chlorine stayed constant and the pH went UP by adding muriatic acid.

Regardless, pool water looks beautifully clear and blue. Thanks for all the help.