Thanks for the response Joshua.

I guess from reading WWM, I assumed that when they said during diatom issues that it is best to have aggressive skimming, I was/am expecting to see something produced.
What you say makes sense to me though as only about 10# of the rock was pretty nasty.

I did call PM today and had to leave a message. They did return my call but said they were on their way out the door so I didn't receive any helpful info :( .

Not quite sure how to feel about that but I am ready to leave my job at quitting time, especially on Friday, so I guess I understand.