Here's a question. My new Pentair Dynamo 3/4 Hp two speed pump is being delivered today. I plan on running the pump on the low speed setting for about 12 hours a day (turning off at night), and only using the high speed setting for vacuuming, running the fountain when we have guests, and during high bather load.

So, if/when I add DE to the filter, do I add to 1lb increase on the low setting, or the high setting? I'm assuming that I add to a 1lb increase on the low setting, but wouldn't that equate to more than 1lb when it is on high?