Foam on water while slamming

The lines do resemble oil, but not only it look foamy it also lack light refraction and reflection that surface oil would case. Even with a lot of emulsification the oil would still have some light refraction (rainbow effect).

Glad it is getting clear.
 
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I have had a foam at the top of the pool when I slammed the pool in the past when it was very bad. I may be wrong but I think the rapid oxidation and pace at which sanitizer killing anything living can cause it but for me it dissipates pretty quickly, I can remember using a skimmer sock and having to hose it out a few times and then it was gone.
 
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