SPS... Too much green!

[mike31154]

Eisen is the German word for iron. Maybe save yourself some money and stop dosing any of that stuff for a week or two. See what happens. If it all turns brown again, slowly start dosing one of those ingredients at a time, if that's safe/feasible. I don't have a lot of SPS so I'm probably out to lunch, but a logical procedure you can document, like starting from scratch with the dosing, would seem like a good way to determine what's going on. None of our systems are identical, so in the end you'll likely end up having to figure this out on your own anyhow.