Continue shopping “5CH-37 Unicel Aquaterra 303279 3113 RST 3113RST Spa Hot Tub Cartridge Filter” has been added to your cart. Product Price Quantity Total × 5CH-37 Unicel Aquaterra 303279 3113 RST 3113RST Spa Hot Tub Cartridge Filter $41.15 5CH-37 Unicel Aquaterra 303279 3113 RST 3113RST Spa Hot Tub Cartridge Filter quantity $41.15 Cart totals Subtotal $41.15 Shipping Shipping costs will be calculated once you have provided your address. Total $41.15 Proceed to checkout — OR — Calculate shipping Country / region: Select a country / region… United States (US) State / County: City: Postcode / ZIP: Update