1.9375" Hole Top/Bottom/3 oz/30 sq pool and spa filter by Tier1
AFFORDABLE REPLACEMENT: Replacement 31489 spa filter for 30 sq ft Hot Spring Spas and Watkins Spas and any systems that needs 5-7/8 inch (diameter) by 10-1/2 inch (length) filters
INCREDIBLY SIMPLE TO USE: Easily replace your old 31489 filter, Filbur FC-3915, Unicel C-6430, Pleatco PWK30 spa filter with the Tier1 spa filter 31489
EXTREMELY DURABLE: Durable and Washable 30 sq ft Pleated Fabric Filter Media to capture sediment and other contaminants with its high strength, high flow design to give you industry leading flow rates for 3 month before your next filter change
SPA FILTER CARTRIDGE REPLACEMENT: This Tier1 Watkins 31489 replacement filter can be used in place of your PWK30 spa filter
100% TIER1 NO WORRIES GUARANTEE: We stand behind the quality of filtration and overall performance of our Tier1 filters