The Princess and the Algae!

[waterbear]

Gregugadawg,
Test strips don't have the precision and resolution needed to do any more than tell you if the water is within a range parameters. (just look at the jumps between color blocks on the CYA, Total Hardness, and pH tests, for example!) They really aren't useful for making adustments to pool chemisty. The errors in reading test strips can be much higher than using a liquid regent with a comparator block or a titration, which is the most accurate short of a properly calibarated meter.

Hope this answers your question.

BTW, questions like this are best started in their own thread in the approprate section.