I have the MiniS Cone, purchased, used from Luke. It's an AMAZING skimmer and doing a heck of a job on my 200 deep dimension!! I empty the skimmer cup (nice large sized cup, which I love) about once a week, and have to use a toothbrush to clean the green/black sludge from the sides of the cup and neck of the skimmer. In the past, I thought I had a decent skimmer. The first time I emptied the MiniS cup, and STUNK up the entire house, for an entire day, I knew I'd had crappy skimmers in the past.