I received these as a free replacement for an order I made a month ago. The first order left black sediment in my water. Customer service was responsive and I received the replacement within a week, but they have the same issue although it is getting slightly better (a week in only slightly grey water instead of nearly black). These are expensive for my lifestyle, but necessary because I don't have good water in my apartment building. I have had to put the water through a coffee filter and wash every piece before each fill.