I think that the anti-freeze won the contest against the water weep system for my foam brush. But, that is because my weep mizer was messed up and I needed to readjust it another degree. For the water weep system, only 2 out of 4 bays were weeping while the anti-freeze worked in all the bays. I also needed to salt the bays today. I was surprised with how many people actually washed their cars today when it was below freezing.