Andreas Kalcker is the one who first suggested 4% HCL.
The CDH recipe is based on 4% HCL, not 5% HCL.
It seems Mark Grenon is the one who came up with 5% HCL with no testing to show why he did that. At the time it was said that 5% HCL was only 1% higher concentration than 4% HCL. That is not true. Increasing from 4% to 5% is a 25% increase. You can prove that using any calculator.
The color you are seeing must indicate an adequate reaction because I think you said when added to 120 ml of water, you measured 100 ppm CLO2 concentration. That reading is higher than I have ever measured. Buy from another seller and compare and tell us what difference you see.
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