Instruction: Given a question and the related document, and generate the answer to the question based on the information provided in the document.

Input:
Question: What number filter does this take?
Document: I recently purchased this item. It is a nice size for the kitchen. Best deal I found in a stainless steel compost bin. It has met all my expectations. I use it to collect items for my own compost bin. It is lacking instructions for replacing the charcoal filter; something that should be remedied but a number of reviews will tell you the simple tricks to do it.
I have had this compost bin for a number of years. Its great. I'm amazed there is NO odor when the lid is on. I like it so well I just purchased an identical bin for my son. He is very pleased with it.
No paperwork was included to describe how long it takes to process, what the material should look like, when to take it out or when to replace the filter.
This is a great size -- I keep it under the sink, even though it is attractive enough to keep on the countertop. And the charcoal filter does its job. I don't smell the compost until I take off the lid.
This is a great product. It holds a good amount of compost before I have to take it out to the pile. It rinses clean with a snap. I get no odors coming out of the can with the charcoal filter. I highly reccomend it.
It's a great size for the counter, and with the charcoal filter, there is no smell. Now I can finally wait to take the leavings out for a couple days, rather than have to go out in the rain/cold/dark to dump them in the compost bin immediately.
It is big enough so I don't have to take it out every day. The filter in the lid prevents any odor.Also I am not a stainless steel fan. I would have preferred white enamel, it looks good on my counter.
Solid little kitchen compost bin. Quality stainless steel -- will definitely take a beating. Charcoal filter is well made and covers the vents from the inside, which keeps the fruitflies, etc out of the compost.Will definitely buy from this company again.
As it starts getting full, foodstuffs get on the filter under the lid, which means I have to take out the filter and do a poor job cleaning it. It seems it would have been a fairly simple thing for the manufacturer to put a washable mesh lining between the filter and the food compartment.
Great countertop compost bin! I wasn't sure I would like having something else on my counter, but this actually looks nice and doesn't take up too much space. We've had it for about 3-4 months and have not yet had to replace the charcoal filter; it does not let any odors out at all.
Answer: I ordered extra filters ... Epica Replacment Compost Bin Filters ... for $5.99 from Amazon.  Each set of filters is supposed to last three months.