I got some at wally world and I need it as a supplement to get rid of my slightly cloudy water and slight odor and to the very little amount that comes in the cartridge. But I don't know where to put it. Could I put it in my AquaTech 20-40's reservoir? In front of the filter, or in back? I'm thinking in the front, cause thats the side that the carbon is on anyway. Thats what I was origanally planning to do anyway, just need some other opinions though. thanx