It has been one week and I have some additional info to add. When I use carbon I notice my skimmer performs better so I place the carbon before the skimmer. This time was the same. The first time I cleaned the skimmer it seem to have carbon dust in it. The second time nothing that looked like carbon dust. Even though I rinsed it I still did got some dust. If you do not have a skimmer then you may want to take this into consideration.