Day before yesterday I came home to a freshly green pool. I opened it about a week ago with iron staining like I had last year. I added some hth brand metal sequestrant to give it a try since it was considerably cheaper than the Jack's I used last year. It removed the stains, and the pool looked great. I'd been adding a gallon of liquid chlorine a day while I was letting the filter and pool cleaner do their thing. Turns out I let my chlorine level get a little high since I was just adding a little liquid chlorine each day without testing, and it messed with the hth metal sequestrant I had put in it. Here's where it gets weird, at least to me; FC was 11.5 the day before yesterday with roughly 75 cya. I made sure the swg was off. Yesterday it was pretty and blue again with just a tiny bit of residual discoloration, so I figured the chlorine had dropped and the sequestrant was doing its job again. Well, the FC was still 11. Does this have more to do with the FC level, or the possible ph fluctuation based on that FC level? My ph was 7.5 when I opened the pool.
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