OK, so just now did 15 gallons which is about 50%. 5 min. later I did the test and guess what. It's coming up the same. Sill 40ppm. Same color. My husband says it even looks darker. How is that even possible? So 3 buckets of water later I get nowhere, nowhere, nowhere. I might as well have not have bothered. I hereby give up. He seems fine with it so I guess that's just the way it's going to be.

Thanks for all the advice,
Carole