I just started up my SWG again a few days ago, and was quite surprised to find my increase in FC only about 1/2 of what it was last summer! Is this thread possibly explaining that this could be because my water temperature is currently only 60oF, as opposed to 80oF when I measured the FC increase last summer? And should I also expect a slightly greater increase in pH at the lower water temperature (probably not enough to measure, but just asking)?