Always maintain your spa filter as outlined below to ensure healthy spa water. Refer to page 51-52 for additional information. Required Filter Maintenance. Your Read and carefully follow the requirements for your hot tub's support base found in the Section 4.0 titled, “Locating Your Sundance Hot Tub” (page 8) or as Please Note: The Circulation pump automatically activates if the spa requires heat regardless of the programmed time. LOCKING THE FILTER CYCLES.Sundance spas OPTIMA Pdf User Manuals. View online or download Sundance spas OPTIMA Owner's Manual. Important Safety Instructions for All Spa Owners. Congratulations on the purchase of your new Sundance® hot tub! The maintain your spa filter as outlined below to ensure healthy spa water. Congratulations on the purchase of your new Sundance® hot tub! The maintain your spa filter as outlined below to ensure healthy spa water.