I'm sorry, but these just aren't as good as people said they were. 'The colors often are dramatically different from anything on the color chart. 'And when the colors ARE readable, the readings they give are often dramatically different from what I get with my Taylor 2006 test kit. 'The Cyanuric Acid test and the Hardness test are surprisingly the most reliable tests on this strip.
If you want to be able to manage your pool's chemistry correctly, you need to be able to analyze the water accurately. 'To do this, you should invest in a good dropper-based test kit, such as the Taylor 2006. 'Seriously, get a good test kit, and you will never go back to using strips.