Detection limit for Wal-Mart kit CH test??

[waterbear]

I usually wait 2 minutes before doing the reading. So if I keep adding indicator, if I have no hardness, the water will eventually turn blue. If I do have hardess, it will turn pink (instead of purple like the instructions say), and then I titrate from pink to blue, then multiply drops by 50 to get my reading?

Basically, yes. The color is sort of a pinkish magenta when hardness is present and blueish when there is none.