Need to SLAM, PH is 7.8

So...8:30 last night- my CYA is about a 35, so I added the appropriate amount of bleach and brushed twice before midnight. 12 hours later the over night test showed no loss of FC less than .5 of CC yet I've still got brown dirt/residue on the bottom of the pool. I honestly thought it was algae, but now have my doubts. I just read about others having similar problems from Cottonwood trees, and boy are they in full bloom right now...could this be the reason I continue to have dirt/residue on the bottom of the pool, especially at the corners and creases?
Pool is clear, except for the residue, wife says its very gritty, not slimy.
Thoughts?
 
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