hd714

I do own one,and have found it to be very accurate and easy to use. The results with the ColorQ always match my drop kit. I just find the ColorQ easier to use. Also, if you run back to back tests with the Colorq, the results are almost identical. Hope this helps, HD

They use the same minerals and are made by the same company. I switched about 6 months ago. Just set the height with the stick high enough that you can grab it when you take the cap off of your filter. Hope this helps. HD714

quantumchromodynamics - Good points. I will aim for a CYA of 35. chem geek - I had no idea CYA broke down over time. I thought that once it was in, it was in for good. Thanks. NewB@Spa - The 15 teaspoons was used in the following manner: 6 tsp for initial shock. 3 tsp to maintain a FC of 2ppm. The last 6 tsp were used as another shock. I use Nature2 and MSP, so my chlorine levels are lower than most. Hope this helps. HD714

Thanks for the links, good info. I will go with the calculated level then, and just enjoy the tub. I appreciate you taking the time to answer my questions, Chem Geek. HD714

Thanks for the reply, Chem Geek. My chlorine level responded as expected, so I don't think it is a density issue. Is all dichlor created equal? Can age affect cya and not Cl? Am I over analyzing this? Should I just go with the calculated level and forget the test results? Thanks, HD714

First off, I would like to thank everyone on this board for the great information here. This board has made my first year of spa ownership a joy. Now my question..... I have added 15 teaspoons of dichlor over the course of a two weeks (fresh water). This should be 31ppm of chlorine. And should also be a CYA of 27 or 28. But my tests show a CYA of 20 with the TFT100 kit, and 22 with the ColorQ Pro7. Tests are conducted with a water temp of 70 deg. F Any idea why the discrepancy? Thanks, HD714