After finishing my SLAM I have little piles still settling at the bottom of the pool. I try "brushing" it up. It disturbs very easy but I feel like brushing alone isn't stirring it up enough to get it up to the skimmer and have it filtered out. Guess I need to get the vacuum back out on it. It seems to be a brownish gray in color and my FC is still holding steady. What does dead algae look like? This seems more brownish gray than white.