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It's indoors. And I agree it's a lot of chlorine to lose that quickly.

I haven't done an overnight FC loss test, because the level's still dropping 4-5 ppm every 8 hours or so. The water is a bit less murky than it was a few days ago, and I can see the bottom pretty clearly; it just has a sort of sepia tint. CC has come down slightly, to 1.0 ppm or so. My filter...

Just an update: I've continued to slam the pool to no significant effect. Today I decided to bump up the target FC level to 18 ppm. If I don't see any improvement in the next couple of days, I'll consider draining the pool and starting over. Very frustrating.

Yes, I've thought about that, but I did it a couple of years ago and had the same problem after I refilled it.

Thanks for the response. I know now (after reading here) that phosphates aren't the real issue. I have no idea how I'd get iron in the water, unless it's an ingredient in the junk the pool store sells. It isn't a problem in the city tap water. I've also learned that Endless Pools' recommended...

I'm having a recurring problem with the water in my Endless Pool. Several times over the past two years, the water has developed a brown tint (almost can't see the 42" bottom). Before I discovered TFP, I was following EP's recommendations, which were to keep the FC above 0.5 and to use the...