I made a home made activated charcoal filter for a bait tank one time. I was using a barrel to hold the bait and just bought a bottle of charcoal from walmart in the fish section. I took an old pair of my wifes panty hose and filled it with the charcoal. Then I took this and made a small holding tank from a milk jug and put the charcoal "snake" in it. Pump your water from the bottom of the tank into this jug and let it drip through and out the bottom after making drain holes in it. The charcoal will kill the amonia in the water which usually is your culprit for dead bait. The amonia uses up the oxygen before the fish can.Originally Posted by Fishn N Wishn