I use the activated charcoal and filter packs at Miejer they probably have them at walmart also just never looked. I used a galvanized water tank 100 gal. threaded a pump into the bottom, with a livewell screen on the inside of tank. and run a tube up to top and have a plastic square tupperwear kinda thing screwed into inside top rail. Drilled a bunch of holes in the bottom run the hose in top and BOOM minnow tank.