i'll get you started. are we talking wastewater plant process? septic treatment? leech field? clarifloculators? aeration basin?I’m more interest in the Ferric oxidation state of iron, I mean I can take or leave your Ferrous state molecules. I relate primarily to the red of Ferric Oxide as opposed to the green of the Ferrous verity and don’t get me started as to the advantages of Ferric Chloride over the Ferrous in sewage treatment. You can keep your Ferrous oxidation state as far as I'm concerned.