Dawndenise - in case your problem still exists and/or resurfaces over the next while, it's not pollen or dirt - read the sticky thread at the very top, there's only one way to kill that stuff and that is high FC (25-30) for an extended period of time (5-7 day) - even if your pool looks spotless after day 1, because it'll be back like a bad nightmare.....
I'll probably get blasted by someone for this, but I've helped cure enough people of this problematic stuff to make me feel 100% comfortable in stating the above, others haven't.