In a 10,000 pool, a pint of 10% chlorine should only raise your chlorine by about 1.5 ppm, so unless the chlorine was very evenly distributed, it's possible or even likely for you to get a zero test result. Add in the fact that higher percentages of chlorine tend to break down quicker if stored in light/heat than the lower percentages, so depending on how long that bleach has been in the store and how/where it was stored, it may no longer be 10%.

I have never used 10%, but I would assume that it would smell the same as the 6% bleach that I use. THat's a great price!

Janet