In this video we show you how to replace your Arctic Spa filters. If your spa has the Peak II Ozone system, then you'll have two skimmers, one with a black top, and one with a gray top. In the skimmer with the gray top, you'll insert the stubby filter and rescue bag, and in the skimmer with the black top, you'll insert the taller Silver Sentinel Threaded Filter. If your Arctic Spa has only one filter skimmer, then you'll either use the Silver Sentinel filter with threads, or the one without threads that has holes on each end. Every three to four months you'll want to replace your filters for best results.