https://www.amazon.com/gp/product/B00JJ49GKS/ref=ppx_yo_dt_b_asin_title_o00__o00_s00?ie=UTF8&psc=1
It also comes with this container.
https://www.amazon.com/gp/product/B00JJ49EQY/ref=ppx_yo_dt_b_asin_title_o00__o00_s00?ie=UTF8&psc=1
This will destroy your Sake in a second. Glad I only wasted 2L of my batch. Granted, the batch is only for testing purposes to figure out the ratio of Activated charcoal to Sake for filtering purposes, but still.