An experiment--Which order and materials do i use?

P the material down the conveyor belt under the magnets. This will pull the steel out. Have the conveyor belt dump everything into the sugar water tank. The aluminum will sink to the bottom, where it can be scooped off the bottom with a net. The milk jugs and soda bottles will float on top of the sugar water. Skim them off and put in the tank of water (1 g/cm cubed). The soda bottles will sink in plain water and can be scooped out with a net, while the milk jugs will float on the water and can be skimmed off with a net.