The G2 treatment solution 101 now contains a specific component that allows chemical detection and chemical level monitoring to be done visually with a simple sample from the system. When you draw a sample from your system the water will be colored various shades of pink (watermelon). Use a white sheet of paper as a background. Strong definitive pink indicates great protection. If only a very light pink undertone appears of if your color has faded from previous sampling, either situation indicates the need for another dose. Remember with G2 overdosing it is not a critical issue. Simple and handy. We still recommend testing the system at least annually as nothing replaces testing to be sure of proper chemical levels and system protection.