Guardian Pool Spa Filter Replaces Sundance Microclean Ultra SET 6541-397 Outer Filter # 6473-165 and Inner Filter 6473-164 6473-164 6473-165 INNER AND OUTER FILTER SET 2 3/16'' OD SLIP TOP 4 7/16'' OPEN WHOLE BOTTOM 6541-397 Sundance Microclean Cartridge Set 3oz White Reemay Filter Fabric Guardian Ultra Filtration Filter Replacements