Need y’alls Opinion. Water test pic below. Water looks beautiful but this staining on all the white plastic stuff (polaris, drain cover, skimmer and basket, deep end built in stairs) is driving me nuts. Was looking around for staining issues earlier and the reasons were all over the board. I’m leaning towards either organics or iron. Vitamin c tabs whitened the stairs and the Polaris bag. Tried leaving some in filter baskets when pool was off to see if they helped, but not really. I know this site preaches ‘no magic bullets’ but I see recommendations from time to time of jacks magic and pro team metal magic. I even thought about the poly fil in the filter, but my water isn’t dark or discolored... I’ve seen something somewhere where the sand in the filter may be harboring iron??? I did a deep clean a couple of weeks ago and only been on TFP method a month or two. Am I just impatient?