Made mine from leftover 2″ copper pipe, 2 ft. long. 3 coffee filters and a layer of cheese cloth, further supported with aluminium screen, these are fastened to the pipe with a house clamp. Fill pipe almost to the top with activated charcoal. You will need to run a lot of water through it first to rinse out all the fines, changing out the coffee filters. alternately, use a fine meshed Hollander to rinse the charcoal. Works very well, ran two pints heads and two of tails through it, cannot distinguish that from the hearts.