Need new spa filters? We have all the right sizes and shapes for your make and model. Our factory original replacement filters are designed specifically for Watkins Manufacturing makers of the Hot Spring spa brand. Specially designed filters are critical since Hot Spring spas filter 100% of the water 100% of the time. The filters play a key part in Hot Springs' "hydraulically balanced" systems. Hydraulically balanced means there is one square foot of filter fabric per one gallon of water flowing through their systems. This equation is doubled in the new patented Tri-X ceramic filters. Balanced water flow makes efficient filtering, perfect jet pressure and a happy jet pump.