Guys, please forget about activated carbon and acetone, don't ruin your product. Acetone adds odor, because it is difficult to remove completely. Carbon absorbs good stuff from solution and not needed at all, use paper filter.
Pentane or butane work best for extraction with solvents.
I cant comment on using acetone as I have never used it before and no desire to do so in future. Ethanol and iso are my chosen methods of extraction.
I will comment on the use of carbon though.
"don't ruin your product." To the contrary. The use of carbon is going to enhance it.
Not sure what you mean by "use a filter paper instead". Regardless of using carbon or not, unless it is sintered or fritted, a filter paper is still required in a Buchner funnel. I dont use fritted funnels as acid is required to clean them thoroughly. I use perforated funnels.
Now, on the use of Carbon. In my opinion, carbon is absolutely required if you want a clean, smooth, and presentable concentrate. I have been using Carbon in my refining process since I first started making oil years ago. The difference is night and day. Taste, potency, and presentation.
Originally, I was using the assumption that 'more is better'. So I was using copious amounts of carbon. Likely twice as much as I needed. This still resulted in a potent concentrate. Then I had read a couple different articles that suggested Carbon can and will absorb desirable cannabinoids. At that point, I drastically reduced the amount I was using. But knowing the benefits, I continued using carbon sparingly.
Today, I use approx. 5g-10g activated carbon for every 1oz of flower used. The amount used depends on extraction temperature. Room temp extraction requiring more. And sub-zero needing less. I mix the carbon directly to the solution and filter it out through DE. This yields the best results. I had tried the 'cake' method as well. Making a cake of Carbon above the cake of DE, and then filtering the solution through the two cakes. Very ineffective and a waste of carbon.
Thankfully, a company has done some research and published their results. Their research indicates and concludes that the loss of potential cannabinoids due to the use of Carbon is negligible at best. Please read this:
Does Activated Carbon Cause Yield Loss in Cannabis Extract?