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This Filter Is a High Quality Replacement and Revolutionizes Spa Filtering And Maintenance. This Offical Watkins HotSpring Filter Can replace the standard PWK30. The Watkins Tri-X filter is 3-dimensional to more effectively filtrate by depth and surface, creating a longer time between cleaning cycles. Each ceramic fiber Tri-X filter provides 65 square feet of filtration. Fits All HotSprings Spas. The unique design enables it to filter twice the water per minute than a common filter.