*Money Saving 3-Pack* When you order this product, you will save $3.00 off of the normal retail filter price. You will receive 6 genuine Unicel replacement filter cartridges. This 4 ounce filter has an open top and an open bottom with 158 pleats. It has 2 cartridges per set with a stick handle, and is rated for 50 square feet per set. The Unicel spa filter cartridge should be inspected monthly and replaced every six to eight months if the spa is maintained properly. Save $3.00 when you order the 3-Pack. Note: FOR SUNDANCE SPAS, PART NUMBERS C-4401 AND C-4405 ARE REQUIRED TO REPLACE 6000-134