Any ideas what this foam is?

[pabeader]

I got home from work today and my pool was crystal clear. (this was taken this morning)

http://i722.photobucket.com/albums/ww221/Robert_Pieciak/no_foam_zpsczhnzbq1.jpg

Of course I noticed a few specks of dirt and bugs on the bottom. Since the pump has been on for at least 2 hours I just used the brush to move it into the bottom drain. Hey, since I got the brush in my hand I might as well give the whole thing a quick scrub. Got my K-2006 out and did the full gambit.

FC - 5
CC - .5
pH - 7.5
TA - 100
CH - 300
CYA - 30

Turned around to look at the pool and OH NO! It now looks like this.
http://i722.photobucket.com/albums/ww221/Robert_Pieciak/foam_zpsppdnxoso.jpg

It's a very thin foam. Almost looks like tiny bubbles that kinda stick together.

I grab the brush and help it into the skimmer. It seems to have gone away again.

Any ideas what this might be. It has happened twice in the last two days. I brush the pool and within a few minutes, Latte'

After it cleared up I added MA to bring down pH to 7.2 I have metal issues!
Put 1lb CYA in a sock. Hang it near stairs.

 

[JamesW]

Have you added algaecide? The n-alkyl type will foam like that.

 

[pabeader]

No algaecide for me. Only approved TFPC chems for me.

 

[duraleigh]

Has anyone used the brush for anything else? Just guessing.

 

[pabeader]

Unknown. I'm the only one to use it, since I've been involved with the pool. Before that. As far as I know it was a year or more with no maintenance.