for some reason I have had two batches of CS go yellow on me. Both batches have had to brew for some six hours for half a litre and then still been only about 12ppm (which drops to 8) so I had to run them on for another hour or so. Both have gone slightly yellow so I added two drops of H202 - 35%. Well, it has gone clear after a few minutes and reads at 10ppm which is what I want. This is the first success I have had doing this but I have to say that this time I did use the 35% whereas the other times I had used store bought 3%. dee
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