When you kill algae it often turns white and the water often looks milky. It can take from a couple of days to more than a week to clear up the water from that point, assuming the algae is all dead. Once the algae is all dead, and assuming your filter is working correctly, you should see a visible improvement in the water each day.
Inexpensive TA tests are much more likely to have problems from interference by other things in the water (like metals or high FC levels). One thing to keep in mind is that you are waiting for a color change, not for a specific color. It doesn't need to turn pinkish, there just needs to be a change in the color.