Re: I think it is algae now....
It's not mustard. Mustard doesn't settle in the cracks. Also, when you brush or vacuum it it's back in place in about an hour or two. I suspect it's just normal junk from not vacuuming, possibly some pollen mixed in to give it color.
I would strongly suggest getting a better test kit that uses FAS-DPD chlorine testing such as a Taylor K-2006 or a TF100 from TF Test Kits. (google them, it's owned by someone who is a member here but I don't think he is active on this particular forum much but he is busy on another pool forum.)
Last edited by waterbear; 08-07-2008 at 01:50 PM.
Retired pool store and commercial pool maintenance guy.
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