I use one or two Shout color catchers in every laundry load. I don't care what laundry detergent I use as they all work fine with the color catchers. I don't have to separate laundry so it is a time saver and my clothes look brighter. I use cold, warm or hot temps whatever the items need. If you wash a load of reds the color catchers will always come out red to pink. When they come out gray then you know all the colors mixed together in the water. This gray color is what makes clothes dingy.