Hi. Thanks for the links and advice. Thanks to this forum and the advice I've gotten, It seems I am on the right path. Keeping the chlorine in the dark yellow to orange area has been helpful. Brushing 1 - 2 times a day along with running our Dolphin has loosened some of the scale and along with it taken out algae with it. Here is my problem, While I fully intend to get a K2006 kit, some recent issues with other household problems have stretched our budget farther than we'd like. It's an expense that will have to wait. In the meantime, My HTH kit, while maybe not the most desirable, is still better than dip strips and will need to do for now. This takes me back to my question on the yellow color test result. Nothing in the HTH instruction guide deals with that result. Has anyone had this experience with the HTH kit? One thought that comes to mind is the high chlorine level. Could that mess with the test result?