Split from Well Water Zea3
This is what I learned from this post. Please let me know if this is wrong. Iron that is oxidized (from chlorine) will stain pool surfaces. Adding acids like ascorbic or citric acid will form a salt type molecule that lifts the iron from the pool surface. It is still in the water but as an invisible salt. Iron in this salt form will eventuly come out of solution and stain again when it is oxidized by the chlorine (breaks down the salt molecule). Putting in a sequestriant will bind the iron salt molecules with the sequestrient which will inhibit (temporarily) the iron oxidation from chorine. Since the chlorine is continually trying to oxidize (or breakdown) the iron salt sequestriant matter you need to keep replenishing the sequestriant which is expensive.
Given that I have one questions:
Is there a affordable and user friendly test for "bad" form of iron that can be monitored so we can only add sequesrient when needed. The so called maintenance dose is obviously designed to insure over-kill
Sorry for the over -kill on my post but I need to wrap my brain around the science here. Any help is appreciated.
I have been to the pool school and also rea/re-read the very extensive posts on staining.