Hi Scott…I love your Scott’s Antidote way of preparing CD and have made several of the kits based on your photos. I am trying to figure this ppm issue out: you say adding 10 drops of A/B to 100 ml water is 300 ppm; to 500 ml is 60 ppm and to 1000 ml is 30 ppm. Question: to make a stock solution of 3000 ppm using the 10 drops of each, how many ml of water do I add? This is probably quite simple, but I can’t figure it out…and once I get that stock solution, then I could test it with CD strips, the same way I test my CDS solution? Thanks so much!!!!
Update: ok…I think it is 10 drops (depending on drop size) of A/B to 10 ml of water = 3000ppm? or….do I add that 1ml of A/B to only 9 ml of water?