I owned these type filters many years ago and did not think they were still manufactured. The models I owned were the Aquamaster PL (Larger model) and the Aquamaster PME (smaller model). In my opinion, they were the best filters ever made. Do you know how old these filters are? They are easy to set up like any HOB
filter. At the bottom of the filter,if desired,a layer of carbon. On top of the carbon,goes the filter floss. They are very powerful filters and have a high rate of water return.