Sorry for the late response. Here's some answers:
- I do not re-use the filters. Northern Brewer sells the filters. They are not expensive. I think around 5 bucks.
- Yes, the filters remove all the yeast sediment.
- The filters are shipped sterilized so they are not cleaned or sterilized before use.
- The other filtering equipment is cleaned and sterilized with star san just like the other brewing equipment.
Overall the system works great and makes the beer look nice and clear.