Shop for filters at Arctic Spas! We sell all Silver Sentinel Micron Filters which are the official filter used for all Arctic Spas. Silver Sentinel Filters are 100% maintenance free. Simply throw out the filter after three to four months and replace it with a new one. No washing or cleaning required. The Silver Sentinel Filter utilizes a thick filter medial to capiture the particles inside of the filter instead of just catching them on the surface. This filter will filter down to 1 micron where other cartridge filters go down to only 70 microns. Just install it and forget about it. Used filters can be recycled. We also sell several cartridge pleated filters that are compatible with Arctic Spas, like the C-4950 Unicel filter.