Arctic spa silver sentinel filter- 2008 and older models

NOTE: This if for 2008 and earlier Arctic Spa models. It has an open top and bottom with no cap and no threads. Pristine Spa Water with a Minimum Fuss. Arctic Spas use a simple and effective spa filtration system called Active Skim Filtration. This system utilizes an infinite-telescoping weir which applies a powerful vortex to the surface of the water where most contaminants accumulate. This vortex draws water down into the filter assembly where it is screened through a one (1) Micron Silver Sentinel filter. Additional water is drawn from the bottom of the spa through the suction fittings where it is also screened through the filter before returning through the equipment and back to the spa. 100% of the spa water is filtered over and over again, assuring you of the cleanest spa water possible.