Continue shopping “Unicel Aquaterra 303279 3113 RST 3113RST Spa Hot Tub Cartridge Filter 5CH-37” has been added to your cart. Product Price Quantity Total × Pentair ETI400 Heat Pump Stack Flue Sensor 475601 $57.01 Pentair ETI400 Heat Pump Stack Flue Sensor 475601 quantity $57.01 × Pentair ETI400 Heat Pump Fan Control Board 475978 $119.01 Pentair ETI400 Heat Pump Fan Control Board 475978 quantity $119.01 × Unicel Aquaterra 303279 3113 RST 3113RST Spa Hot Tub Cartridge Filter 5CH-37 $44.01 Unicel Aquaterra 303279 3113 RST 3113RST Spa Hot Tub Cartridge Filter 5CH-37 quantity $44.01 Cart totals Subtotal $220.03 Shipping Shipping costs will be calculated once you have provided your address. Total $220.03 Proceed to checkout — OR — Calculate shipping Country / region: Select a country / region… United States (US) State / County: City: Postcode / ZIP: Update